Dear K.D. Kahl: Your branch of the Aplin family is quite well known to me.If taken back far enough, it encompasses the Aplins who settled in Rhode Island and Pennsylvania. I like to think that your line began with Peter Aplin who married Dorothy Poole at Taunton, Somerset, on 20th February,1683.Their son, Benjamin, married Elizabeth Perrain in 1717, and their son, Benjamin (1717-1773), married Susannah D'Oyly.He was then a lawyer in Oxford. Benjamin and Susannah had (at least) 10 children. One of these was Peter Aplin(1752-1817) who you referred to as a Captain in the British Navy.He eventually became an Admiral of the White. Apart from Admiral Peter Aplin, there were four other sons: Christopher (1747-), Benjamin (1751-1817), Oliver (1754-1831) and Robert (1758-). If we assume that your great-grandfather, Benjamin, was married in about 1870 and was born in about 1845, he is likely to have been a grandson of one of those brothers.The difficulty lies in the fact that they had a lot of sons and often carried the name through. If you are certain of your grandfather's birth details, I suggest you obtain a copy of his birth certificate.If you let me know the details on it, I may be able to help. Best wishes' Bill Aplin.