They should be able to sit and have a civil conversation about these issues, and shouldn't try to step on you while you're trying to work through your concerns. If they can't have that conversation, of if they try to prevent you from airing your concerns, or if they don't take those concerns seriously, then you should think very carefully about what kind of people they are and what you think the relationship will look like down the road. I can't imagine it would be very much fun to be a co-owned slave in a household with a warring husband and wife dealing with jealousy and anger management issues.