A man as a non-Mahram to his father-in-law's wife

Q 3: Am I a Mahram (unmarriageable relative) for father-in-law's wife like I am a Mahram for my wife's mother?

A: Based on what your stated, you are not her Mahram. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.