My own! (15.5%)
A family member (69.3%)
A close friend (11.5%)
No September parties for me (19.3%)
My sister was born in September. So was my son, who was actually born on the same day in September as my Aunt. Busy month with September friends too, for sure.
I can't say I know anyone (or if I do I'm not close enough with them to know their birthday off hand) that's in September. I know lots of October and November people though.
My mom's birthday is September 18!