Your gr-grandfather, Peter William AINSLIE can be found on page 3 of Cohasset Genealogies and Town Histories by Davenport & Davenport published 1909. He was son of: Peter, b. Halifax, NS 1840: m 25 Dec 1860, Ellen, dau. of James and Catherine (Murphy) ROONEY. She b. 1844.He m. 2nd 28 Nov 1876, Mary Ann, dau of Patrick and Mary (McCarty) DONOVAN.She b. 1852.Of U.S.Navy in the Civil War. Chidr b Coh by 1st wife, i. Mary Rebecca 21 Sep 1861; m 27 Nov 1879 John E Kinsley.She d 10 Jan 1882. ii. Helen Catherine, b 11 Nov 1863. iii. Katie E 1865, m 5 Feb 1884, Joseph F Martin. iv. Delia Frances b 22 July 1866, d 13 May 1867. v. Delia Elizabeth b 27 Sep 1868, m - Frothingham.She d 30 Nov 1894, E Boston. vi. Peter William b 15 Mar 1870 vii Catherine Ellen b 24 Jun 1871. Ch by 2nd wife: viii. Claude Garrison b 7 Sep 1877. I cannot explain the difference in birth year and the mother.Davenport is generaly quoted as a reliable source but does have some errors. A phone call to clerk of Cohasset for a look up of record may help or a visit to State archives.Peter was son of: William GARRETT and Margaret POWERS who came to Cohasset, MA from Halifax, NSHe d. 19 Apr 1863, age 81-19 days.She d. 5 July 1873, age 71 yrs 3 mos. Childr b Halifax, NS John 1827; George E 1829; Henry 1834; Robert 1838; Peter 1840.Feel free to e-mail me.