op mention that the bad behavior started because she got a 200 dollar allowance and started traumatizing her younger brother with it. Op daughter should have apologized to her brother and she refused. I bet the father could care less about what op's son is dealing through because it is not his child. If op removed the money it would be considered stealing. I do not think that father would change the allowance because her daughter earned it. Daughter does not seem to care about younger brother. This is what op brother said to younger brother in her own words

She said that the younger brother is a useless dumb spoiled brat. She said that the younger brother is a useless dumb spoiled brat. That right there is verbal abuse. Know lets switch roles. The younger daughter is heavily being bullied by older brother now what would you say here. Ntb because daughter is being traumatized by men. Daughter clearly knows how she is acting. Refuses to apologize and could make son commit suicide.