PUPALAIKIS, MARY May 18, 2016 of South Boston. Loving wife of the late William Pupalaikis also of South Boston. Beloved mother of Billy and his wife Barbie Pupalaikis of Southbridge. Adored daughter of the late Alice and John Sidlauskas of South Boston. Cherished sister of Billy Sidlauskas and his wife Trudy of Florida, Bobby Sidlauskas and his wife Wendy of Raynham, Johnny Sidlauskas and his wife Kathy of Marshfield, Ricky Sidlauskas and his wife Amy of Bridgewater as well as Denise Kelly and her husband Bob of Middleboro. Also survived by many loving nieces and nephews. A Funeral Mass will be held at St. Monica’s in South Boston on Tuesday at 10 AM.