What We Know About This Character
* Professor Minerva McGonagall was married to Benjamin McGonagall, who was a Muggle. He died of old age.
* Professor McGonagall is Deputy Headmistress as Hogwarts School of Witchcraft and Wizardry. She is also the head of Gryffindor House (as she was in Gryffindor when she herself attended Hogwarts), as well as Transfiguration professor. She is an animagus, and can transform herself into a cat, which is quite useful for keeping an eye on her only granddaughter.
* Minerva and Benjamin had one daughter, Mary, who did not inherit the magical abilities. McGonagall was shut out of her daughter's life once she married George. McGonagall was not allowed to see her only granddaughter, Leslie, until she herself came to Hogwarts.
* Professor McGonagall is known to be quite strict at times, but her love for her granddaughter is still strong, despite the trouble Leslie gets herself into.