Conversation so far:
Who was thomas?
Thomas inherited his father's estates in 1425 and was placed in the wardship of the King.
Are there any other interesting aspects about this article?
Thomas Malory was born on 6 December 1425 at Moreton Corbet Castle, Shropshire, the eldest son of Sir William Mallory.
who was his mother?
Margaret, the widow of Robert Corbet.
Did he have siblings?
CANNOTANSWER.
What was his childhood like?
Nothing else is known of him, apart from one peculiar incident discovered by William Matthews.

Question: What was the incident?
Self-contained rewrite: What was the incident?