Alito did NOT say opposite sex siblings living in the same household was incest, nor was it implied. Back years ago it was not uncommon for bachelor and maiden siblings to live together either before or after their parents died or even after spouses passed away. Only a dirty minded liberal’s would jump to incest.
I know siblings who were going to share an apartment, but one died just prior to the move. Families take care of each other.
Well, I’m not a dirty liberal mind, but, until you pointed that out, it never occurred to me that siblings living together DOES NOT imply incest (although I never would have thought that thought, until after reading the excerpt).