Multiple wives = Multiple Mothers-In-Law
The only advice I've given to my sons and nephews is "don't come to me for advice on women," and "don't marry a woman who has more that 2 or 3 sisters. My wife has 6 sisters, and that's about as bad as having multiple mothers-in-law. Check that, it's worse, because I got along great with my MIL.
My sons and nephews have concurred 100% with #2, because they have their own issues with one or all of those aunts.