They "Big Kids" really seem to like Caleb. Not just tolerate him but genuinely like him. I haven't really seen any jealousy either. They are always talking to him, sing to him, want him to read books with us, etc. When we tuck Jack into bed each night he asks for Caleb to sleep with him. I know that they dynamics of their relationship will continually change but for now I am very content and pleased with how they love one another.
Hanging out on the couch.
An un-staged kiss.
Lunch on the front porch, none for C of course.