Are there family members of Easter Cooper and Oscar Williams who can help me find my family?

my great great great grandparents were Daniel & Beaty Williams who had a daughter name Rosa Williams my great great grandmother,

Rosa Williams married Ned Hill and had about 12-14 children one of which was my great-grandmother Percilla Hill (born poss in 1870) who was the mother of my grandfather.... Joseph Williams. One would think that with this much information, I would be able to trace my family roots...WRONG!...I can't find Percilla Hill and what happened to her, unfortunately, she is the missing link that could connect the dots but I can't find her!.....PLEASE HELP!....all I know is that there is a Family reunion of the Williams that meet every year! but I can't find them either!.....and I am linked to the williams that are linked to Easter Cooper and Oscar Williams.I believe my family was sold between the Coopers, Williams, Hill, Carr, .... just to name a few somewhere between South and North Carolina, and possibly Florida...anyone with any information ........PLEASE HELP ME!