Betty Lee Sinclair (Beyea) age 93 passed peacefully on Monday morning April 22, 2019 at Queen Anne’s Nursing Home in Hingham, MA. She was born in Medford on October 25, 1925, the daughter of Dow & Elizabeth Beyea. Betty attended Dedham High School followed by Boston University where she earned a B.A in Mathematics & Physics. Upon graduation she worked at Raytheon as a mathematician on a guidance system for the Nike missile project. In 1949 she married her beloved husband Samuel Sinclair and remained married for 67 wonderful years until Sam’s passing in 2016. Together they raised three children: Douglas, Richard and Janet. Throughout her life Betty was actively involved in both Church and Community. She was a Co-Chair for the Building Committee at Old South Union Church in South Weymouth, Past Deaconess at First Congregational Church of Braintree, Past President of the Evening Division of the Old Colony Club of South Weymouth, a Past Director of the Evening Division, and Past President of the Massachusetts State Federation of Women’s Clubs. Betty loved the outdoors, and spent many summers in New Hampshire & Maine golfing, camping, fishing, hiking, skiing and rock collecting with her family. She and Sam were also avid bridge players. In addition, Betty was a highly skilled miniaturist having built and won awards for her mini-houses and other creations. A devoted Mother and homemaker, she leaves two sons, Douglas Sinclair and his wife Deborah of Duxbury, MA and Richard Sinclair and his wife Marcia of Hingham, MA; a daughter, Janet Lee Cannon and her husband Dan of East Granby, CT; six grandchildren, Allison Conroy and her husband Sean of Duxbury, MA, Samantha Sinclair and her fiancé Zach Cook of Concord, NH, Elizabeth Nida of Raleigh, NC, Samuel B. Sinclair and his wife Meredith of Hingham, MA, and Alexander Cannon and Victoria Cannon both of East Granby, CT; and a great grandson, Bennett Nida. Her family will receive friends on Friday, April 26, 6-8 p.m., at Peck Funeral Home, 516 Washington St., Braintree, MA with a private family service to follow. Memorial donations may be made to the First Congregational Church 12 Elm St. Braintree, MA 02184.