From the Murdock Genealogy - compiled by Joseph B. Murdock (1925)
Ruth Murdock born October 2, 1762 in Warren (Weston), Massachusetts, died July 3, 1816 in Northbridge, Worcester, Massachusetts married Marvel Taft on April 29, 1784 in Uxbridge, Worcester, Massachusetts.Seven children of this marriage are listed.
Marvel married sisters Ruth and Molly.Marvel's brother Calvin was Molly's first husband.
Parents of Molly and Ruth: Benjamin Murdock and Catherine Read
Parents of Benjamin Murdock Benjamin Murdock and Mary Hyde
Parents of Benjamin Murdock Robert Murdock (born about 1665 in Scotland) and Hannah Stedman.
I have dates if you want more detailed information.