RUN! FLEE! It's getting deeper!

The union of:

My mother's mother, my g-ma

and

My mother's father, my g-pa

gave rise to:

My mother

Her brother, my uncle

Her sister, my aunt

Her other sister, my other aunt

and there are...

1 2 3 4 5 6 7 8 9 10 spawn from those 4

I need to figure out everyone's initials/maiden names...