Opal.
It makes more sense the second time around.
Personally, I think Claire and Opal are supposed to be somewhat similar, with the grandfather, mother, and father being the other members of the family.
Each member of the family hasn’t different issues. The father is insecure, the mother can’t stand the family, and the grandpa is a smoker.
They live opposite lives to that of the perfect suburban fantasy in a billboard
But the thing is, that fantasy isn’t real.…