Is it permissible for a wife not to wear a hijab in front of her husband's stepfather, and is he considered to be in the position of a grandfather?

It is forbidden for the stepfather and the paternal grandmother to marry any of the wife's descendants, as Allah Almighty says: "And your stepdaughters who are in your guardianship, from your wives with whom you have consummated." As for the wife of a stepson, she is a stranger to the husband of her husband's paternal grandmother, and even to the husband of her direct mother. It is permissible to be married to her and her husband's mother at the same time. Therefore, it is not permissible for your wife to uncover in front of the husband of her paternal grandmother, and he is not in the position of a grandfather to her.