Hewitt was born about 1914, the son of unknown parents. The place is not known.
His wife was Annie Caird Donaldson. They were married, but the date and place have not been found. Their three known children were William Donald (Private) (1943-?), Alistair MacKinnon Donaldson (Private) (1944-?) and Thomas Loudon (Private) (1946-?).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | ABT 1914 |