My mum died from cancer when I was 14 and my sister was 16. My dad started going out on dates I guess, within a year.
Within 3 years he was remarried.
Don't get me wrong, it wasn't exactly easy but for me, I wanted him to be happy. I didn't want him sitting around in mourning. He was 50, far too young to be alone for the rest of his life. That was just how I approached it.
You are of course able to decide who is around your kids. But don't get ahead of yourself. I'm not sure that anything about your mum having a new friend suggests this will be a long line of strangers involved with your kids.
I really feel for you. It's obvious that the death of your Dad has been really hard for you. No one new will ever take their place. xxx