Mentally ill family

I feel like I’m the glue holding my family together. My mom and sis are suicidal. I have an autistic brother a teenage sister with the same teenage attitude we both had and then two siblings under eight.

I’m always listening to my moms issues because my siblings have told my mom not to speak to them. They hate her and have a lot of resentment.

My mom is on medication and I asked her to go see a therapist but I don’t know what to do. I can’t talk to anyone who is mentally stable because they are too young. I can’t talk to my mom her older sister because they are depressed suicidal and can never be happy for me or can never be there when I’m sad. I have to pick up all the pieces. I have to hold it all together. What do I do?