This source created a long-standing error by stating that Rebecca m. Samuel Rickard and her sister Hannah m. Giles Rickard are children of Nicholas Snow. However, this would make both of them about 10 years older than their husbands, and so is unlikely.
Children of William Snow and Rebecca Brown: Hannah Snow m. (1) Giles Rickard, m. (2) Joseph Howes Rebecca Snow m. Samuel Rickard Mary Snow, probably married John Rickard, but conclusive proof has not been discovered