Is it permissible for a woman to appear before her father-in-law without wearing a headscarf and by wearing a short-sleeved dress?

Dear Brother / Sister,

A person’s father-in-law is like his/her own father-in-law. Therefore, it is permissible for a woman to remain alone with her father-in-law and to serve him. It is permissible for her to appear before her father-in-law without wearing a headscarf and by wearing a short-sleeved dress.

The phrase "their husband´s fathers" in verse 31 of the chapter of an-Nur and the phrase "your wives´ mothers" in the chapter of an-Nisa form the basis of this issue. That is, the father-in-law of a woman is like her own father and the mother-in-law of a man is like his own mother; they are non-mahram eternally.

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