Questions like these seem so easy to answer until it's you. Warning- it's lengthy. Sorry in advance.
Background: about 10 or so years ago, the family found out that my grandpa had another child. In his younger days, he was quite the ladies man (things you don't want to know about your grandpa). Apparently, at one point he and a woman he was seeing found out she was pregnant. He asked her to move in with him. She said she wanted to break up and raise the child on her own. No child support. No contact with him. No ties. Kid grows up and wants to meet his dad so his mother finally gives him the info he needs and BAM! Shocked the entire family. The only person that knew was my grandma.
Fast forward: My family is open to anything and greeted this stranger with open arms. He started coming to as many family functions as he could and they are all in close contact. He visits family regularly. I have never met him! Until yesterday, I had no idea what he even looked like (turns out he and my dad look a lot alike)
My grandma asked if he was attending the wedding because she was making their hotel reservations. He said he never got an invite. She told him that they hadn't gone out yet (at the time, they hadn't) and that she's just sure he's getting one. Never asked me until this week, I had not invited him because I have never met him and he wasn't on the list of people my dad gave me to invite, After my grandma calls a ring of people upset, my dad finally just calls his brother to see what's going on.
Apparently it's been awhile since my grandma "invited" him and he has already started looking at travel arrangements. He told my dad "I know I haven't met your daughters, but I would love to finally have a chance to. I understand she is not obligated to, but if she does, I'll try my best to attend"
I'm sensitive. It got me right in the feels. Do I go ahead and send him an invite? He knows that it would be an afterthought, but he is oddly okay with it.