Family Problem

besides all mentioned above wouldn´t it be more fun to play together at times as well on your own accounts?

I think he should start on his own and not be given your account, yes he'll be disappointed but it"ll also be a great lesson.
Maybe have a discussion with him and ask him to put himself in your shoe.
Often when situation come up with my kids (as an exemple if they did something they know they shouldn't have), I will ask them what they would do if they were in my situation, how they would deal with this issue and sometimes they come up with some very insightful answer.

I would suggest deleting every account and you can both start over.

don't share anything.

Kind of agree with letting him create his own account.
My cousin played bunch of games on my account when I used to live closer and he visited. He racker some 40 hours on GTA 4 alone..
Actually saved up and bought himself playstation with bunch of games. Kind of had the whole experience that much better getting his own console. his own games and progress for himself

just gift them to him and make a new account it might sound dumb but he will always be grateful to you

Hello, how about to share save files. I mean files.
Most of games (except online games) have save files placed in their directories in Steam catalog or "My docs" catalogue. So, it's could be possible to copy and give it ti him. He will need to place it in right place and it's done =D
Some game, likes GTA IV, could request additional actions but Holy WWW should have answer by manuals for this.

If it's talking about online games so they usually have own accounts. That's why u could try to check is it possible to relink it to other Steam account or unlink it totally.

Have a good day!

P.S.: I'm not sure is it true but I remember "Account will be VAC-banned if shared account get VAC-ban. VAC-ban is permanent and it's not possible to escape even if it was received as a result of hacking".

he should be thankful that you allowed him to play on your pc. he has no right to demand these accounts. he should move on.
if its progress in single player games you could copy the savegames from your pc and transfer it in the same folder after installing the games on his accounts. other than that i dont understand how he can have 5 years of progress from apex legends which is basically new and fortnite is a free game.

I like the idea of gifting him something small... but you should print out one of those dark soul "git gud" memes as a sort of card and put the gift card in there lol.

as an aside, to me, the is one more reason why single player games are better. if we were talking skyrim or borderlands, just give him a copy of the save files and done.

//edit: one other thought; you could also find an online co-op game and offer to play WITH him on weekends with your acct. that both gives you an excuse to keep your own stuff as yours (not that you should need an excuse) and a reason to encourage him to have his own. for example, warframe fits nicely IMO. but not sure if that's similar to the games you mentioned tho except in regards to the online aspect. and if thats the case and you were planning on some kind of gift then you could opt for a decent gaming headset instead of gift card.

plus you can always enable steam fam share if you want to share other stuff.

buy him a switch, or ask his parents buy one for him.

I don't know how's your dinamic with you nephew, but in my case, when my nephew came to 12 I gave him his own account, with a few of the cheap games that he used and loved in my account (Rocket League, Castle Crashers, Just Cause 3, Limbo, Inside, etc...and even threw some Minecraft Premium Account) and he loved it. He even finished all them much before I would ever do (mustly because I left them unfinished :V).

For the other part of "feeling old"...I'm hittin 30 this year and still love very much my collection (but still, he knows that all my digital library is for him and the physical one for my other nephew in case of something happening to me), so I can't just give up on my things.

Not sure how to solve this, but thanks for getting this to my attention. My son has always played on my accounts, and as he's growing up, it might be good to get him his own account if he starts playing any online game seriously . (At some point I'd also have to discuss with him a personal Steam account, but I think that's a few years from becoming relevant.)

Sharing is caring...until it no longer is. At 12 he wouldn't appreciate a Steam account to its full extent. And isn't 13 the minimum age for joining and participating in Steam activities? It's not like 1 more year would represent maturity but I guess it would still be better than resorting to gaming piracy.

I am 40 with a 4 years old son and I'll never share my account even hes older,

Share the current games, since you let him play them on your account in the first place.

Let him know that for future games, for which he has by definition not played on this account, he should play on his own account.

I did a quick search on BAN before posting this and I found that already three people posted this. You are prone to get banned. With his own PC he will start experimenting probably.

He should be more than happy with his new independence and that has to compensate his loss. Plus, he can learn that these things sometimes happen IRL. Did you never lost your progress/work/info/pictures, etc for a Windows reinstallation or a faulty drive? They are just games, and him enjoying them should be more important than an inventory and a progress bar, that would be a great lesson.

You're going to have to detach at one point anyway, so better sooner than later. Yeah it's a bummer to lose that amount of progress, but it's part of growing up, he has to be his own person now. :)

Edit: Also what ryogareloaded said ^ about the risk of getting banned, very good point.

NO.
Been wanting to reply but I've not been feeling well, so here goes, Let me elaborate on my opinion:

1. It means he's coming over lesser, which is a bummer. Actually, have you talked with your sibling why they gave him the PC? Was it mainly for school work, for him to develop interest in programming, or simply for him to game?

2. True gamer never quits. You might not be gaming now if you're busy in real life, working, dating, etc but as you get on older you might find more free time and you might want to get back on gaming again. Unless you're 1000% sure you'll never game again or resolved to not game anymore due to reasons.

3. Game accounts holds more than just games, there's personal information, records, game pals, etc. Like for a site, SG you require a Steam account and if you continue to use the account that is no longer in your possession, what happens when an issue pops up. Telling others that its your nephew that got vac banned isn't gonna help, in my honest opinion.

4. Apart from Steam or any game account you have tied to any service. Perhaps account like Origin/Epic which is pretty independent depending on how you sign up should be easy to change details etc. Does he have a phone? How is he gonna activate 2FA? Its important, even with security measures, an account could fall due to phishing details, etc.

5. I rather he start anew. If there are games that he played and you are able to save the Save Files and transfer over the details, that's the best. As alot of other mentioned, the sense of ownership and responsibility. If you're a father figure to him then you should, if I may suggest to guide him on how to be responsible online and safeguard himself and his details. Its painful to lose progress but its also part of the process. Yes, he might not meet the age limit but there are 100 rules how many have we actually kept in place. Although I am not suggesting malice, I feel in this case we can turn a blind eye on the age and guide a new generation on responsible gaming.

6. Gifting him games might benefit him more than just gifting him an account. He should learn to chose his games and perhaps his parents/you have a list for him to chose from. That will help him to cherish his gift more than taking such actions for granted. You've mentioned about saving disappointments for his later life, I have to disagree. I came from a poor family so from young, I understood disappointment and also understood not to demand as much growing up. Everyone can grow up different, even if we have the same experience, they might develop different from the outcome you've hope for but I feel, with proper guidance and you spending time explaining your reasons. Even at a young age they might not understand and sulk about it, eventually, they might understand. Hopefully.

7. I too have a nephew whom is slightly old that lived with my parents, his family and myself till he's nearly 12. During his stay my sister often feel we mistreated him and not giving him enough to eat as a growing kid. Kids reminds me of the goldfishes my siblings and I rear when we were kids. We each take turns to feed them and they just keep popping up and feed themselves till . . . they flop over. I hate to be correct but my nephew now has gastric issues, at a young age. If he stuffed himself too much he spends 15mins in the toilet having stomachaches. Recently, when he came over, I was vacuuming the place, his mother was going out to get food and such. He says he's not going, I told him, he'll not be able to move around and it'll be noisy. He said he's fine. The moment his mother closed the door, he took out his mobile and start playing mobile games. Of course, I went over and told him my piece about it. As elders, I do feel there's a need to address proper gaming culture. Gaming is not unhealthy, its the way we game that's unhealthy. That I myself is a criminal of too.

The rest is up to you, Cheers, Regards and Well Wishes, Cruse~