Guest list question...

My cousin passed away last month after a terminal cancer diagnosis. She had been sick on and off for over 10 years. She has a daughter who is 20, a son who is 17, and a husband of about 4 years who we had met once. Her ex husband is still very much in the picture and I know him well from childhood. Both children live with the ex.

We are sending out our wedding invites tomorrow. Initially, we had planned to invite the four of them, excluding the exhusband for space, as we're already inviting 4 more people than our venue can comfortably hold. Now that she has passed, we've been reassessing. My mom thinks the best course of action is to invite my cousin's two children and the exhusband and not invite her widower as we only met him once. However, her daughter is now asking to bring her bf, as well. I don't know him and they don't live together. It is reported that she doesn't go anywhere without him. If her mother hadn't recently passed I'd say hell no and not think twice, but I'm trying to be considerate, given the situation.

Should we invite him even though we've never met him and he was not on the list of even potential invites?