From the book " The Baronetage of England," printed for John Stockdale, published 1806: Sir William Gerard married first Anne, the daughter of Sir John Preston, Baronet. They had 4 sons and 6 daughters. -- William, John, Thomas, and Francis and Mary, Elizabeth, Anne, Bridget, Frances, and Winifred All the sons except William had no issue. All the daughters except Anne died unmarried. He married secondly Mary, sister of Sir Edward Mostyn, Baronet. They had no chldren.

http://www.thepeerage.com/p41840.htm#i418395 Anne Gerard is the daughter of Sir William Gerard, 4th Bt. and Anne Preston.2 She married Charles Waterton.1 Her married name became Waterton.

Citations

• [S37] Charles Mosley, editor, Burke's Peerage, Baronetage & Knightage, 107th edition, 3 volumes (Wilmington, Delaware, U.S.A.: Burke's Peerage (Genealogical Books) Ltd, 2003), volume 2, page 1536. Hereinafter cited as Burke's Peerage and Baronetage, 107th edition.
• [S37] Charles Mosley, Burke's Peerage and Baronetage, 107th edition.