I have two friends, I'll call them Jane and Jon, and they have a daughter, we'll call Sara.
We're still friends with both Jane and Jon, but they are no longer friendly with one another (loooong backstory, don't ask). Jane is one of my bridesmaids, but we didn't include Jon in the wedding. Sara is a flower girl.
I try to keep my nose out of their personal custody issues because it's a very sore subject, but as far as I'm aware, they have 50-50 shared custody.
Should I include Sara only on Jane's invitation since she's a member of the wedding party and they should be arriving together the day of the wedding anyway? Or just put her on both invitations? Although that may cause confusion for Jon regarding who's bringing her.... I opted to do the online RSVP through my Knot wedding website, so I was leaning towards just listing her on both anyway and just informing him that she's a flower girl and should probably just come early on the day-of with her mother.