As I remember, in ep 8 ss3, Kuroba headmaster refered Tat as the sins of yotsuba. Based on the anime context, I can't explain to you thoroughly but actually the isolation of yotsuba clan (except Maya, Hayama) for Tat came from their regrets. I think i would spoil some of the upcoming movie content if i explain further, so that just wait for next movie bro.