He is, or was at one time, married. Because he mentioned a daughter somewhere....I think.
*Checks wikipedia*
Here it is:
Stroud lives in St Albans, Hertfordshire, with his daughter Isabelle and his wife Gina, an illustrator of children's books.
"You belong in Gryffindor,
where dwell the brave at heart,
Their daring, nerve and chivalry
set Gryffindors apart."