Im Scared of my Mum Dying?

Help me Im only 15 My dad is already dead (He died a few yrs ago) and I am not scared of dying its never seing my mum ever again no matter if i am reincarnated or not I will never see her agian for all eternity and my dad is gone I will never see him again. (He was catholic so I hope god saved him). I miss him so much and I keep thinking my mum will die she looks so weak since dad died.