A George Fletcher (66) is shown on the 1881 census in Hatfield Broad Oak, Essex, as a Hair Cutter and Dentist, I cannot prove that this is the same man, but this was the era of the barber dentist, which may be where the tradition of dentistry arose in the Taylor family.
Name on Rose Anna Hepburn's death certificate is either Tonnor or Tonner
The connection between James Bell and his son is not proven, no certificate of birth.
Details on the death certificate suggest that she may have been born in 1809, I however favour 18021 _MEDC Insane, commited to Ayr District Asylum
2 DATE 13 AUG 1872 AND 15 J
2 SOUR S442
3 QUAY 3
This likley to be the same Charles McKerrel, both son of James McKerrel and husband of Helen Taylor, but I have not been able to provide a definiative link.
Educated guess at parents Alexander Stewart and Cathrine Millar
Note on Mary Jane Thompson's marrage certificate that her reputed father was William Thomson