The ruling on a wife saying "my mother" to her husband's mother

Question:
The brother Abdullah al-Hajj asks: Is it permissible for a wife to say "my mother" to her husband's mother, or "my father" to the father?

Answer:
This is disliked. It is disliked for a man to say "my mother" or "my sister" to his wife, or for a wife to say "my brother" to her husband, or to say "my mother" to her mother-in-law. This utterance is disliked because it resembles the women who are prohibited in terms of kinship.