Poems

We are having a small wedding on a cruise ship. About 25 people. I have two children (9 and 10) and my fiancé` has a daughter (23) we would like to include them in the wedding as much as possible. Any suggestions? Does anyone have any poems about joining two families? Idea`s on lighting the candle with the families? My parents are deceased and only his mother is still alive. Also any "blessings" that include the children?