Hi Gortinanima
I take it this is the William Forrester who was born on 3 September 1677 and baptised in St Columb's Cathedral. His parents were Rev Alexander Forrester and Mary Church who married in St Patrick's, Coleraine, on 13 July 1676. This is the extract from the Cathedral Register -
"Alexander Forrester, Curate of the Cathedrall Church of St Columb – Derry, and Mary Church were married by Mr James Stuart, Clerk, the 13 July 1676 in Colerain.
William, the son of the said Alexander and Mary was born in Londonderry the 3rd September 1677 and was baptised in the Catherdrall Church of the said Cittie by Mr Andrew Henderson, Clerk, upon the 7th day of the said moneth, his godfathers being the Honerable Collenell John Gorges and the Rev Peter Manby, Dean of Derry, and his godmothers Mildred, the wife of the Right Reverend Father in God, Robert Lord Bishop of Derry, and Elizabeth, the wife of Alderman Samuel Norman, Esquire."
I have some information on William's siblings and descendants, mostly related to the Church family connection, but nothing on his wife. I understood he had another son not mentioned in the familysearch file quoted - Arthur, who married the daughter of Thomas Church of Aghanloo. Let me know if there's anything I can help you with in later generations.
