The husband's mother can be called mother-in-law, in order to appear friendly, you can also call mom directly. In Guangdong, the husband's mother is called "grandma"; In southern Jiangsu, it is called "Grandma". In addition, if your mother-in-law's surname is Zhang, you can call her "Zhang Ma" to distinguish between your mother and mother-in-law, to avoid the awkward situation of calling one and agreeing to both.
