William married Maude Sharples on 1 Feb 1561–2 in Kirkham, Lancashire, England. Maude (daughter of Richard Sharples and Elizabeth Bolton) was born in 1542 in Preston, Lancashire, England, United Kingdom; died in Dec 1607 in Preston, Lancashire, England, United Kingdom; was buried on 9 Dec 1607 in Kirkham, Lancashire, England, United Kingdom. [Group Sheet] [Family Chart]

1. Alice Threlfall was born about 1557 in Hazelhurst, Bleasdale, Lancashire, England; was christened on 20 Jul 1570 in Kirkham, Lancashire, England; died about 1610.
2. Edmund Threlfall was born on 14 Jul 1561 in Fylde, Lancashire, England, United Kingdom; was christened on 14 Jul 1561 in Fylde, Lancashire, England, United Kingdom; died after 11 Nov 1617 in Preston, Lancashire, England, United Kingdom.
3. Margaret Threlfall was christened on 23 Nov 1567 in Kirkham, Lancashire, England; and died.
4. Alice Threlfall was born in 1570 in Fylde, Lancashire, England, United Kingdom; was christened on 20 Jul 1570 in Fylde, Lancashire, England, United Kingdom; died in 1629 in Fylde, Lancashire, England, United Kingdom.
5. Cuthbert Threlfall was christened on 4 Apr 1574 in Kirkham, Lancashire, England; and died; was buried on 9 Jul 1602 in Kirkham, Lancashire, England.
6. Ellen Threlfall was born in 1589 in Kirkham, Lancashire, England; was christened on 1 Dec 1589 in Kirkham, Lancashire, England; and died.

John married Mary. Mary was born in 1510 in Fylde, Lancashire, England, United Kingdom. [Group Sheet] [Family Chart]