Something drew my attention to this part of the tree, and when I got time I took a closer look and found that a recent merge between duplicate "Joan Masseys" had been UNmerged. And rightly so, imho. However, I also noticed that her duplicate was still connected, causing all of the children to have two mothers and additionally a duplicate brother, "Philip".
So I thought it would be wise to remove the duplicate "Joan Massey" with her "unknown" husband, as parents to the children. Doing so removed the duplicate "Philip" automatically -- but it also removed another sibling which perhaps should have stayed put (I'm not sure, but it is an MP so maybe yes).
So since the profile notes for her list her parents, I tried to reconnect them but only got an "ERROR" notification and was unsuccessful. I don't know why that happened, but I'm just letting the curators know about it.
