Though this marriage didn't take place in Hampshire, I assume the same rules would apply: Is there a minimum age at which someone can sign as a witness to a marriage? The marriage in question, of my great-grandparents, took place in London in 1897. The two witnesses were the bride's father, and a cousin of the groom - who was only 13 at the time. Surely a child of that age couldn't take legal responsibility for such a signature, as it's done to prove the marriage itself was legal? Margaret