Here are two cents from a complete Beotian: stronger warnings on the profiles of Hugh Manning's sons, as well as on Hugh Manning himself, could help understanding the situation. There is also no information about the disputed connection on Margaret's profile.
I hope I don't sound... well, unpleasant. I've received the same kind of advice over & over again when complaining that profiles for fictive people had been reconnected.
Why not PPP Hugh Manning's sons? Because otherwise, next time there is a merge, there will be a mother reconnected, it's just too tempting to add one generation, especially when it doesn't say it should not be done.