The funeral day versus scares

I was released last night from psychoward today is my moms funeral I have to go in an hour but now realitys hitting me the house is mine the car i mine and all 6 kids are now gonna be under my care.  brielle if she was a kid that would make 7 but she is 18 i cant say shes a kid.  I know this may sound stupid but im scared of one of my cousins.  Alex has severe uncontrolable bipolar his anger outbursts become too violent I can never control him the others are also afraid of him when he gets into those outbursts I dont know what to do with him.  I cant have him beating any of us up.  my mom usually lets him get away with it i cant do that i dont know if i could my ife the little ones lifes this scares me.  defiance i can handle we all in my house have it.  Alex is 17 and just like his dad my uncle alex they both have uncontrolable bipolar.  Brenna is 4 and yes shes still in diapers she has a developmental disability same one i have but hers is worse she will never walk potty train thats what the docs told my mom they said same thing about me but i walked potty trained even advanced in classes I know brenna can do it too but if she cant ill be there for her until i die.  brittany is ok brooke is ok emma is ok chris has bipolar but he controls his so hes ok  Most of them have severe adhd like i do but hey i can handle that.  the younger ones know they ge time outs when being defiant.  Brielle lies alot I need to trust her but Im still figuring out why derek left her because of her lies because shes looks pregnant and believe me she does  shes got a belly.  I just dont know what to do I need help