Joan Margaret McNeil Williams-Theriault of Weston, formally of Somerville and Framingham beloved wife of the late Joseph Theriault of Cambridge and Robert Williams of Somerville. Cherished mother of Jamy Faust and her husband Peter of Waltham, Robert Williams II of N. Hollywood, CA, Scott Williams and his wife Charlene of Waltham, Bonnie Webb (deceased) and her husband Stephen Webb of Bridgewater, Julie Scott and her husband John of Reading, Kenneth Williams of Boston, Chris Cappelletti and her husband John of Milford.Dearest grandmother of Robert Williams III of Mexico City, Mexico, Neil Scott of Boston, Shannon Sandersen of Martha's Vineyard, Stephen Webb of Branford, CT, Annie Webb of Pembroke, Carli and Jack Cappelletti of Milford, Ryan Williams of Waltham.  Delighted great grandmother of Susan Bonnie Webb of Branford, CT. Retired from Tufts New England Medical Center Blood Bank after many years.  Family and friends are cordially invited to attend the visitation from Cota Funeral Home, 335 Park St., North Reading on Thursday, 2/16 from 4:00 to 8:00 pm.  The funeral will be conducted from St. Catherine of Genoa Church, Somerville at 11:00 am on Friday, 2/17. Internment to follow at Mt. Auburn Cemetery, Watertown, MA. . In lieu of flowers, please send donations to St. Vincent de Paul.