Teddy, 78, who married the actor's father Hutton Gibson in 2001 and is currently locked in a divorce battle with him, claims Mel is responsible for their break-up after her spouse filed for divorce and forced her to leave her marital home in June, reported TMZ online.
Earlier this month she filed for a restraining order against Mel, alleging the "Braveheart" star had threatened her and tried to sabotage her marriage.
In legal documents, Teddy said, "Mel and his sister Maura have a grudge against me because I don't approve of controversial medical treatments they have been urging my husband to undergo for his various illnesses.
"They also manipulated their ailing father into filing for a divorce, something which my devout-Catholic spouse wouldn't usually agree to."
