Looking for information on William & Alexander Somerville 1800s

Hello, hoping to find information on my family in Aghavea.My great great grandfather William Somerville was born 1830 in Tyrone. When he married Margaret Savage atEnniskillen CofIParish Church in 1858 he gave Currin, Aghavea as his place of residence.William and Margaretlived at Carrowkeel, Aghaveain 1869 when my great grandfather Richard (no. 7 of 8 children that i know of)was born.Margaret and her sonJohn Somervillewere stillat Carrowkeel in 1911.I know the yearof birth forWilliam fromhis marriage & death details, his father was Alexander Somervillebut I haven't been able to find his mother or anybaptismal or marriage records for his parents. Any help would be greatly appreciated.