Life with divorced parents

Today wasn't very interesting, I baked some brownies, watched some tv and was annoyed by my autistic little brother. But my parents are divorced and we live with our mom. This weekend my little brothers are going to stay with my dad as they do every two weeks but I never go with them.
He came to pick them up about a minute ago and his girlfriend (a smoker, not very smart, jobless) calld my mom a bitch. And just because our dog wasn't back from her friday walk with my mom's nephew! I knew my dad had sunken pretty low but I never expected this from him or his soon to be wife!