William Frederick Costin was born on Wednesday 10 February 1869 in London Colney, St Peters, Hertfordshire.

William married Olive Edith Lovett in 1898 in the Watford Registration District.

He had the following children from his marriage to Olive Edith Lovett:

- William Richard Costin	born on 18 March 1899 in London Colney, St Peters, Hertfordshire.
- Dorothy Olive Costin	born on 7 May 1903 in London Colney, St Peters, Hertfordshire.
- Frederick Costin	born in 1906 in London Colney, St Peters, Hertfordshire.

The places where he lived have been identified as:

From	To	Place	Source of Information
1870		London Colney St Peters, Hertfordshire.	Note 1.
1901		77 Colney (main road to London), London Colney St Peters, Hertfordshire.	Census Data.
1911		5 Sion Terrace, Tingewick, Buckinghamshire.	Census Data.

William was a Horse and Cattle Dealer.

Details of William's death are not known.

Notes - Sources of information:

1.	See 1901 Census. William's birthplace.

Census Data:

Year	Address
1901	77 Colney (main road to London), London Colney St Peters, Hertfordshire.
1911	5 Sion Terrace, Tingewick, Buckinghamshire.
1939	Carlton Victoria Farm, Bedford, Bedfordshire.