If he's not the nurturing type, he's going to get tired really fast of dealing with this child. Likely the child will be plopped into the arms of a mom or a girlfriend.
You will be able to tell quickly if the child is unhappy with daddy.

Sadly, too many people use children as their way of fighting their ex.
Hopefully this guy will get tired of it quickly.

Your sister needs a better lawyer. sadly, that's how things get done in this country. spend as much $$ for a lawyer as you can, it's worth it.