Ok, I think I know what the answer is to at least one of these questions, but wanted to double check so that I don't make a an etiquette faux pas.
My dad and his girlfriend have broken up (again). The list of guests my dad provided me with are entirely her friends. He had included two of his friends initially, and removed them. We have already sent out save the dates to his list. We'll be sending the invitations out at the end of July (8 weeks, wedding is OOT for many). I assume that since his list has been sent StD, they also still get invitations. Correct? This also may not end up being a problem since there's always the chance they'll get back together.
Secondly, should I give him a chance to add some people that he identifies as his friends? I don't want this to come off as a B-list, but I don't want him to be there without any friends (and only family being me and my siblings). It'd be a minor pain in the sense that we already have our envelopes addressed.