my ex was a big boy and i was always really worried because i knew how much he wanted to go to
disneyland but i was worried about him fitting on the rides, so before i took him i had asked a CM if there were any rides that a larger person might have a difficult time riding. She said space mountain was the main one. Although my ex fit, he was really uncomfortable, but delt with it for the ride, and even rode it mutliple times
On space mountain each person has their own lap bar and its kinda skinny, but ive seen plenty of larger people on it.
On splash mountain unless you want to be COMPLETELY soaked, dont sit in the very front, but i doubt they would place you there since you have little ones. My ex was stubborn and sat in front, he was soaked and i was pretty much dry
Other than that, Pirates, TM, Indy, HM, ToT, Soarin, CA screamin, pretty much all the main rides should be more than fine.
Hope you have a GREAT time!!!!