Q 1: What is the ruling on
a woman calling her husband "My son" while joking with him? Is this considered Zhihar (a woman likening her husband to an unmarriageable relative)?
If so, what is its Kaffarah (expiation)?
It is Makruh (disliked) for one of the spouses to liken the other to an unlawful relative to marry, such as a mother, a sister, a father, a brother and so on. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.