Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answer updated 1 month ago

Yes it is permissible for husband's father to marry the mother-in-law of his son if she is widowed or divorced. Wife is Mahram for her father-in-law only not for his sons and husband is Mahram for his mother-in-law only not for her other daughters. This rule of being Mahram does not include the parents of the husband and wife. 
'Your mother-in-law must observe Hijab from your father but not from you. Obviously, when they are non-Mahram to each other, marriage between them is permissible.

Wassalam.

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