I'm connected to the Mercer family and may be of a some assistance.

I have Martha M. Mercer married to James Snell around 1864. As well I have 5 children mentioned Ella; Enoch James; Barbara; Mary; and Polly. Also have her obit.

Martha's parents were Robert and Mary (nee Anderson) Mercer from Adjala Twp. Simcoe Co. They are originally from Ireland.

I also have info on Martha's siblings if you're interested.