Heather McCrimmon's dad was a 21st century human.
He once took his daughter Heather to his company's car park when Heather was learning to drive. So however bad Heather was at driving, she couldn't crash into anything. (COMIC: The Secret Army) Years later he celebrated Christmas at Granny McCrimmon's house along with Heather and the Tenth Doctor. (COMIC: A Merry Little Christmas)