I could not locate a marriage for Mary Coffin[?] and Joseph Gillis...If Joseph entered via Canada perhaps the marriage was in VT.
Chelmsford Birth...25 Jul 1857...Joseph Henry Gillis, p: Joseph & Mary Gillis, dad=Moulder, dad b:Cavan Ireland, mom b:Walden[?] VT
Chelsea Marriage...02 Dec 1882, Joseph H Gillis, 25, Steamfitter, b:N. Chelmsford, p:Joseph / Mary C...and...Ellen A Kelley, 22, b: Houghton, p:Daniel / Ellen M....FIRST MARRIAGE FOR BOTH
Boston Birth...02 June 1886, Edward Gillis, 919 Rear Washington, p: Joseph H b:Chelmsford MA / Nellie A b:Houghton Mich, dad=Steamfitter
Amesbury Death...30 Aug 1892, Joseph H Gillis, 35y 1m, married, phthisis, Thompson St, Piper, b:N Chelmsford, Joseph Gillis b:IRE / Mary Coffr'in' or 'is' b:VT ALSO recorded in Lowell....notes buried in Westford