Mother's Day is over for this year, so this is late.
A family member sent me a USA "history of Mother's Day" forward.
This site tells about carnations as the flower for Mother's Day. For all the decades I spent in church on Mother's Day I don't think I ever say a presentation of red carnations for living mothers and white carnations for those deceased. Each family could bring a vase of carnations representing the mothers in their families. Or wear a carnation! It could be quite beautiful. If your people are going to number in the hundreds looking for red and white carnations the day before Mother's Day you might want to pick a florist and order ahead.
Do it for fathers, too! Wear a rose! Red if your father is alive, white if he's deceased. If you want to honor more than one father (or mother), common these days, wear two!!
Maybe you've already done something like that. With all your CM networking, is there a gathering place for holiday ideas? Consider a Pinterest board of holiday CM/Family Ministry ideas!