What is the ruling on completing a marriage to a second wife when the mother threatens to disown her daughter and demand a divorce from her if the marriage takes place?

The mother has no right to prevent her daughter's husband from marrying another woman, nor to order her daughter to divorce her husband if he marries another. She is not obliged to obey her in this matter, and the daughter is not considered disobedient for disagreeing with her, as obedience to the husband is more paramount. The wife must be kind to her mother and strive to appease her as much as possible.