I belong to ancestry .com for about 15 years . They told me that Mary Bolyne was my 12th grandmother.. This comes from Rachel Bowen Barney. Her Husband my 4th grandfather Daniel W, Barney. I am related to Elizabeth Pelham, Anne Humphrey. I will have to check with them again to get the exact line. Ancestry.com also told me That Cecily Neville was also a grandmother. Do you think Ancestry is right ?
The only was to verify is to have sources for each person in the tree between you and Mary.
Your tree appears to have a potential merge between these two fathers of Rachel Barney:
Unknown Profile
Nathan Bowen
The dates don't match so finding source to support one set of dates or the other would be a good start.
Unfortunately Vital Records of Swansea are not easy to find. This is the best study I've seen so far
http://freepages.genealogy.rootsweb.ancestry.com/~smason/combined/f...
The death dates in the profiles were impossible as the youngest child was born after 1746, so I edited them out.
It would help a great deal if the siblings and their spouses were filled in. Apparently the Bowen family is not well studied, so completely filled out Geni profiles make a deal of difference.