RE: Sarah Whitney Reynolds Fantastic, "cousin"! Specifically, I descend from your Sarah's sister, Rebecca Whitney who married John William Lewis.
Not sure what you are aware of, but all of the children of Walter Whitney & Sarah Rosser were born in Wales. They were a fairly well-off family as Walter raised pure blood horses. In fact, John Lewis went back to Wales to purchase one to bring back to the USA.
All of the siblings came to America (Mary, Sarah, Walter, Rebecca, Ann, John, and Leah) except one son, William who married and had at least 13 children in Wales.
The siblings that came to America primarily lived in the Luzerne, Huntingdon, and Centre Counties of PA before some moved out later to other areas.