I am so happy that Scary Mary seems comfortable while sharing the cat tree and she definitely has angel Gerry watching over her. It is hard to believe it has been 2 years now. It seems like yesterday when you brought them all in. You have done a great job with all of your babies...Happy Father's Day! : )
Thanks @whatisnew. After taking these pictures I showed Mary that meathead was above her and so she took a powder and split.
And here I thought she knew he was up there. At least you have one cat who doesn't seem to mind her.
It's a complex social experiment with unknown results. Further interactions and spatial formulas will be needed for positive results... :-)