Awww, he sounds too cute to be true! LOL
Makes me want to get my girl a sibling immediately too! Problem is, if s/he copies her behaviour then s/he'll act all aloof and make mommy beg for attention and be stingy with kisses unless mommy disappears for a little while. S/he'll also be expecting treats often and be sleeping on every end and center of the bed at night. And my poor cat will get both of her ears chewed silly but lucky her, she'll get two tongues catering to her little behind.
I don't think they all do that but I'm no expert as I usually only have one dog at a time and not so young. You are a very lucky one! Twice the affection! And at least Tobie is only copying the "good" behavior so far!