My two favorite words that Thomas says all the time- "Yeah sure!"
"Thomas, can you play with Jake when I take a shower? And not let Hyrum bite, pinch, poke, pull, or in any other way hurt Jake while I'm in there?"
In the car....
"Tommy, can you reach over and buckle Hyrum's seatbelt?"
"Yeah Sure! ... Hyrum, hurry or the police will get us!"
"Tommy, do you know how much I love you?"
:) He makes me smile every single time he says it. And that's for sure!