Dorcas was born 19 Aug 1755 in Uffculme, Devon, the daughter of Richard Gange and Jane Quick - she was one of 6 children. Richard was the son of John Gange and Dorcas Bird; John the son of Richard Gange and Ann James; Richard Gange the son of Reynall Gange and Elisabeth Gower. All of Uffculme.
Reynall married Elizabeth Gower at Uffculme 29 Nov 1649. That is as far as I have been able to go with that line.