I don't have much on Elizabeth Parry as the marriage record shows her parish as being Mold at the time (1813), but on subsequent censuses she is recorded as born in Llanferres, so perhaps she had moved to work in Mold? There are 2 baptisms for Elizabeth Parry in Llanferres in 1785, one to parents John and Mary and the other Thomas and Barbara. Normally children are named after parents and of the 6 children that George and Elizabeth had the oldest daughter was named Mary, but another was Barbara, so not sure that confirms anything. The 2 boys were named George (paternal grandfathers name) and Edward, so again no connection to the Thomas/John from 1785. Therefore I can't confirm if either of these couples are Elizabeths parents etc