Godparents

Holley
I want to ask a close couple to be godparents to our unborn baby. They do alot for us and we'd mike to repay them by making thrm godparents. It will mean alot to them but we'd like to do it in a nice way -like giving them a grsture or something that asks if they will be godparents before baby is born. But we are rubbish at ideas can anyone help? Xxx