My BD11 typically is not a "ride" girl; piss her off and it's a diff story... (typical women..ha) My SD13 has moved in with us ft this school year. My daughter has gone through some stuff this past year and is now finally rebuilding friendships, activities etc....

My SD is by nature a true B*; problem is Daddy thinks otherwise (again typical)
Examples; BD will ask her a question or try to converse with her and SD will reply in nasty rude voice (I am sure you have all heard this) leave me alone; go away; noone likes you; your so stupid. You know all those nice things; in turn, everyone laughes at my BD and SD thinks it halarious... The other day she picked up small rocks and threw them at my BD. BD gets of bus and start to run home just so SD won't pick on her (breaks my heart) The list goes on and on.
Now BD won't ride bus becuase of this; and wants me to change her seat on the bus in case she has to ride it.
I have talk to dad about this and he blames it on just sister stuff! I do understand that sister fight but not the way she does; I think me BD may be scared a little but dad keeps pushing it under the rug...

any thought?? (**We have been together for 11+ Years)