Thanks. Hopefully, being closer, your sister understands more of the situation than you do. Still on the face of it since your mother is scared then
your sister should be as pissed as you are. You must know your sister well enough before now to know screaming at her only upsets you.
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”