My daughter. In fact, I'd probably just include her as a co-winner so she could have half of my winnings. After that would be my sister, dad, and my sister's children.
I would just secure a new house for my mum first if any big money of up to $1 million just enters my life. That's the first thing I would do. The woman has sacrificed so much for me.
It is my parents that I would first of all fix if I ever won a lottery. I would just upgrade their house to a mansion and buy each of them good saloon cars. They are the people that have always been there for me.