Is the mother of my father’s second wife one of my mahram (a relative one may not marry)?

The questioner:
May Allah reward you. Your Eminence, father, the questioner asks: Is the mother of my father’s second wife one of my mahram (a relative one may not marry)? The mother of his father’s second wife.

The Shaykh:
No, she is not one of your mahram (a relative one may not marry); she is a stranger to you. But with respect to your father, she is one of his mahram (a relative one may not marry).

The presenter:
He says: May Allah reward you. Is the mother of my father’s second wife one of my mahram (a relative one may not marry)?

The questioner:
The mother of your father’s second wife. Yes, his father’s second wife.

The Shaykh:
The mother of your father’s second wife is not one of your mahram (a relative one may not marry); rather, she is a stranger to you. Yes.