
$20 says it’s not his kid.

So you think he should be a dick to a little kid and say “I’m not your dad” when the kid obviously sees him as a father figure? Lots of guys who aren’t biological fathers still act as fathers and still get called “father”. My bet is he met the mom While she was pregnant and started dating her and helped raise her son for a time.
I understand how granny feels, and I’m glad she didn’t force our FL to come out, but I’m hoping that she can help keep this secret well in the future.