Weddingbee boards

So we are having a pretty small wedding (inviting 70 people, hoping 60 will show) and are paying for it entirely ourselves.  FI and I made our tentative guest lists- spilt down the middle- 35 people each.  This is not a lot of people and we had to be choosy about who we invite.  His family is HUGE- half of his guest list is immediate family.  So a lot of his extended family is not invited- like his aunts and uncles.  He said he could fill up his whole guest list with family and not have any room any friends. And that he wants people that he sees often and really cares about, not just ones that he's related to but never sees.  I honestly don't have a problem with his guest list (since I've never even met some of the aunts and uncles) but I'm thinking his mother and father might!  He says he will handle his parents and I shouldn't worry about it but I don't want them to think I'm the one who said the aunts can't come!  We don't want to have more than 60-70 people because we want it to be small and intimate and also because we are paying for it ourselves and aren't rich.  We also don't want to say to his parents "if you want to invite them you need to pay for them" because that is like opening the flood gates and then we'd have to let my parents do it too, and pretty soon we'd have 150 people and not the wedding that we are hoping for.  His parents would probably never say anything to him or me directly- but they would complain to his siblings.  So should I let him handle his parents and stay out of it? 

@FutureMrsDuff  Thats a really good point that you make- but I already am taking some of "his" people that are our mutual friends on my list!  But you guys are all right- I will try to stay out of it.