Mums got cancer


My mum has cancer and has been given 6 months to live. I live with my mum and step father. When mum dies I’m going to have to move to my dads except I don’t like my dad and want to go live with my auntie instead. This is really hard cause I’m unable to just say I want to go to my aunties instead cause I’m under 18. Every night I hope and pray that mum wakes up so I don’t have to go live with my dad. Any suggestions