Pete's Dragon, but that is showing my age. My first movie though was the Fox and the Hound in theaters.

Edit* My boys love the Muppet Show and movies.

The Lion King (1, 1 & 1/2, 2)
Shrek
Elf (2003) with Will Ferrell
Toy Story
Jingle All the Way
My little pony friendship is magic
Disney Pricess movies lol

The Land Before Time series. The first one made me cry, but i loved them as a kid!

spy kids 3 is a great family movie with a video game theme even. great stuff! spy kids 3-d actually but i dont think ive ever viewed the 3d version.

When my nieces were that age they loved anything Elmo, they would sit there and babble while he sang. Frankly, I think anything with lots of singing keeps little kids enthralled.

Snow White and the Seven Dwarfs or The Jungle Book could definitely be a delight to watch with your family. :)

Rainy with chance of meatballs or Up

Hm, how about Evan Almighty? xD

Edit: I read that 6 months as 6 years. D:

Maybe Garfield? Or how about Mr Bean?

The Land Before Time.

for me my top 3 movies when i was a kid was a bugs life, the lion king and hercules

Muppit Treasure Island

Looney Toons. More kids need to know there awesomeness. Not exactly a movie (Although there are some) but a there are so many of them that if you get a couple blue rays or dvd's they should last a while.

The Jungle book or tangled, my nephew likes the singing in movies

The Princess & The Frog if you like fantasy romance. Most disney movies are quite decent for family flicks. If you don't like cartoonish, then maybe Big, The Mighty Ducks, or Richie Rich with Macaulay Culkin.

Monsters Inc.

Since you like the other Christmas comedies: The Santa Clause (trilogy). :)

9 Is an awsum movie if you havent already seen it + its in your collection and if you need another movie instead another must watch which your twin girls may love (i personally liked it) would be Space Dogs. Here is a link to the description of the movie Space Dogs personally its worth watching either online or by dvd = http://www.imdb.com/title/tt1272051/ . Also if you need a link to watch the movie online lemme knw :)

The AristoCats (1970)

Toy Story 2 + 3. They as SOOO good.

some of the movies i grew up with:

My Neighbor Totoro

Beethoven

Toy Soldiers

George of the Jungle

Beauty and the beast, Cinderella parts 1,2,3, 101 dalmatins, Atlantis, Alice in wonderland, Brother Bear 1/2 , Chicken Little, Dinosaur, Dumbo, Emperor's new groove, Lady and the tramp 1/2, Hercules, Lilo and Stich, Pocahontas, Ratatouille, Sleeping beauty, Tarzan, The aristocats, The huncback of notre dame, Jungle book 1/2/3, The little mermaid 1/2/3, Treasure planet,Peter Pan, Pinocchio, Snow white and the seven dwarfs, A monster in Paris, Little Princess, Arthur Christmas, Alpha and Omega....
And there are more, but i think those are enough fot the moment :D I am 21 and really love to watch all of them :X

An American Tail, An American Tail: Fievel Goes West, An American Tail: The Treasure of Manhattan Island, An American Tail: The Mystery of the Night Monster, The Rescuers Down Under, The Rescuers, Pomysłowy Dobromir

Any studio Ghibli movie - My Neighbor Totoro or Kiki's Delivery Service are two good ones for young ones...

I'm surprised The Iron Giant hasn't been mentioned. Also, The Great Mouse Detective is a favorite of mine.

Gerimis Mengundang