The past history of his mother doesn’t really matter, whats in the past is the in the past. Secondly, some people don’t show appreciation through material gifts. They might show it through comments or even actions, I don’t know this kid but if he doesn’t bring any thing you shouldn’t think bad of him. You are giving those gifts as a gesture of good will, and a gift is what it is..a gift, you shouldn’t expect anything back. Also, because you are so rich, he might not be, so he might think this is nothing for you guys, but it might be more expensive for him.
In terms of the fb invite, kids these days…thats just how they do things. A call is so old school these days. Heck, i’ve been texted a wedding invite through whatsapp for a really close friend. I’ve know him since grade school… I don’t expect a call, I dont even expect a card…its whatever, just him telling me in someway shape or form to come to his wedding is an honor for me. Yo, like I don’t even call my own uncle and aunt, I love them do death…but I aint calling them.
If you don’t want to go, don’t go, make up an excuse to not go.
Maybe i’m thinking to much into this, but I think you’re associating the way his mother behaved and using that as an indictator for his actions of not giving gifts or doing anything for your kids to that. Like hes a poorly raised kid. Which might be the case, but that shouldn’t have any bearing tbh.