We love your kids. We really do! But we want our wedding to be your night off! We hope this doesn’t create a hassle for you as we want you to relax and have fun with us! But we don’t want kids to stop you from coming, so please let us know!
If your invitation says “and Guest”, then yes, if not, we would prefer if it was just you.
Semi-formal, please. The bride is requesting guests to wear black.