Matthew is very possessive of Mark.  He grabs Mark's leg and loudly and emphatically proclaims "MY Daddy!" to anyone who looks like they might be infringing on his territory!
Happy Father's Day, Daddy!  I picked out this card all by myself!
I've heard this is a really good movie!
I picked out the shirt too!  I like red shirts!
Since Grandpa was here for Father's Day, he got his card hand delivered too.  Matthew never did quite get that Grandpa is Mommy's daddy.
Can we do it?!