My Mom Is In A Toxic Relationship

I am really sad about my mom’s relationship it is affecting me it makes me cry everyday, I miss my mom so much her abuser is isolating me from my mom what can I do legally someone please help me my mom met a toxic narcissist from work that turned my mom & her family against me they don’t see me anymore I am extremely hurt by his actions he also verbally abused me badly calling me awful names including my mom this evil man verbally abuses my mom out of anger from his work shifts