Sonomi Daidouji is Tomoyo’s mother. She is the cousin of Nadeshiko, the mother of Sakura. Sonomi clearly doesn’t like Fujitaka, Sakura’s father, to be the husband of her cousin. It was obvious the way she acted around him.

Her husband was never mentioned in the series nor do I think at the manga. So, no one really knows who Tomoyo’s father is.