Forcing a woman to marry someone and the Mahr being her right

Q: I would like to tell Your Eminence that while they were still young, I decided to marry off my daughter to my nephew without receiving Mahr (mandatory gift to a bride from her groom). When my nephew reached the suitable age of marriage and I wanted to contract his marriage to my daughter, my wife objected. I tried to convince her but she wanted my nephew to pay sixty thousand riyals, although I had intended to marry them without receiving any Mahr, regardless of the amount. Is it permissible for me to marry the two without Mahr, against my wife's will? Is she entitled to this money or not? Would you please forward the answer to the judge of Al-Mahany court, as I insist on contracting this marriage without a Mahr? May Allah grant you success and reward you good. He is All-Hearer and Responsive.

(Part No. 19; Page No. 71)  A: It is impermissible to force your daughter to marry your nephew. Moreover, Mahr is one of the rights of a girl. May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family, and Companions.