My FI and I have been debating about this. My cousin is my MOH and my older brother is my FI's groomsman. As you can see, I think it's really important to involve my close family members in the WP. My FI only has one sister and no close cousins. She got married this year and did not involve FI or any family in the wedding party, but I think I should have her in the wedding party to represent his side of the family. Neither of us are super close to her, but she and I have definitely been getting closer over the past couple years, and I think it would be nice to involve her. I am wondering though if we should include her husband if we include her, even though we barely know him. Also, my FI has 3 groomsman in mind and I have 5 bridesmaids. I know sides don't have to be even, but I have twin 13 yr old brothers that I thought could be jr. groomsmen and stand up on FI's side, but he is opposed to this because I am trying to "force in my family" (even though I'm also trying to include his). Just wanting some opinions....