The couple have three children, a son, Jasper, and twin daughters, Monica and Octavia (both 14)
Wikipedia entry
You do not need to say ‘both’ aged xx with twins, as by definition they will share a birthday unless they are among the very rare pairs born each side of midnight. Nor do you need to say ‘who are not identical’ if they are a boy and a girl. Yes, it is stupid, but I have seen it several times.