How did you decide which surname they have?
A discussion with some middle aged colleagues. Most said they'd got married when they had DC, at least in part because they wanted to have the same name as their children.
Obviously the children could have taken mother's surname but then father has the same issue, that he doesn't share the family name, unless he takes hers.
Hypenating is an option but how do you choose which order? IME people seem to drop the first one as they get older and even if they don't surely would if they tried to amalgate two surnames when they marry themselves?