i know how you feel my situation was slightly different. my dad was physically, and verbally abusive. my mom was stressed a lot and scared of him, so she did little to help, and she probably added some stress to us b/c of the stress that was on her.
you said that your dad is financially stable. your mom is probably thinking about how her life would be if she leaves him, so she puts up with his crap.
i think that maybe you should move and i would make sure the 16 year old moves when he/or she turns 18, and two years after that the 14 would be 18.
child services didnt do much in our situation.
you've been through so much in your life, you need to breathe and relax.
this is the life that your mother choice for herself.
let me explain!
my mom stayed with my dad for 22 years and he abused her and my three other siblings.
she cried for help and left him.
my mom married another no good man for 7 years. she cried to me and i allow her to live in my duplex instead of renting to someone who can pay more money.
my mom went back to her husband, and decide she wanted to leave him.
she moved out of state and i sold my duplex, she cried about how she needed money for furniture.
she is now living with a man who treats her bad. she cried to me to help her get housing in the state where i live.
i can go on and on.
i had to put my foot down. it's more to this story. but understand i also got out of a 5 year horrible relationship, i was on prozac and seeing a therapist. and my mom would always but bricks on my back (her problems).
it's but so much you can do.
i m not sure how i fee about call the child services. theyre like your brother and sister, i m just thinking of what they might have to endure. will it traumatize them even more.