My immediate family is 25 people with significant other and nieces and nephews that are all coming form out of state (must haves). His immediate family is 5 and our parents don't really know each other. I don't want to have this meet and greet be too large, but don't want his parents to invite 20 distant relatives to make it even. My mom is hosting it not the inlaw. How many people is fair to invite from his side?