I believe it. My new teen deeply loves his little brother and is very excited about being close enough to be a big brother again next year. I can imagine he'd feel the same kind of attachment to a baby in the house that he got to see grow up.

It's still seems insane though. A teen, (whose upbrining I haven't influenced at all til now), a newborn (reliant upon me for everything) and a husband-like-person (who I'm technically still raising as well)--I'm going to be so outnumbered!