Robinmask was born in Moonclan to parents who were born after the split. Robins dad was still pretty affected however, as some older relatives separated from his family to go to Sunclan. Robins mom never had a very strong connection with Starclan, even though her parents were very devout.
When raising Robin, his dad didn’t raise him to dislike Sunclan, because he thought the cats there were not inherently bad. Robins mom raised him without much emphasis on Starclan, as she often felt suffocated by her parent’s reverie.
Because of his parents, Robinmask is pretty neutral on Sunclan. (they’re kinda just the guys over there) (After all, if they were completely in the wrong for the fall of Eclipseclan, surely they wouldn’t have had enough success getting cats to go through with the split, right?) she actually emphasizes with them sometimes because she has little to no connection with Starclan of his own. Robin acknowledges Starclan's existence, but really could not care less.
Robinmask is autistic and tends to mask around clanmates. They have a hard time making friends because its too much for them to try and match other cats energy. However after going practically their whole life without any real friends, Robinmask has been trying their hardest to interact with others.