Toxic family members

My SO family members are so toxic. They back stab and talk shit right in front of my child. They cuss, talk about sexual stuff and also put me as his own mother and even his father down. They don’t respect what i want and they expect me to bring my son to them. I really have a hard time with his father too. He’s so disrespectful and doesn’t help me with my son. My son turned 1 and his dad has never given him a bath. Finally changed a poopy diaper just 2 weeks ago. I just i’ve talked to him plenty of times and things don’t change