Need Assistance in Grammer

Only thing I can see is in the second line, you're missing a verb. You don't do what much these days? Hang out? Spend time together? Other than that looks like a nice lil speech :)

"then" at second line seems inappropriate as a connect, I would use "however" as you're going against the fact that you don't talk these days.

"f it wasn't because of you, i wouldn't be a changed person."

If it wasn't for you, I would be a different person.

Grammer? why no Grimer?

View attached image.

Also talking seriously, "You made me become a man of honor and respect and hard work." too many "and's", the first "and" can be replaced with a coma ","

Just to combine a bit of suggestions others have offered:

I know we don't talk much these days.
But/however, I wanted you to know that you are everything to me, my brother, my father, my mother and my sister.
You are my world.
If it wasn't for you, I would be a different person.
You taught me the values of honor, respect, and hard work.
I Love You Brother.
I wish you a very happy birthday.

It's a very nice speech. An added thing, the line "If it wasn't for you, I would be a different person" If you are trying to emphasize that you've made positive changes thanks to them, then you could say "I wouldn't be the person I am today if it wasn't for you".

Anyways, whatever you say, it's obviously coming from the heart, so they'll love it I'm sure!

that is very sweet of you. I'm sure your brother will notice the love, more than your grammar :)