Is it permissible to object to the high dowry demanded by the girl's father, which may lead to unnecessary extravagance, and is it permissible to object to the father's interference who will offer to pay the dowry?

High dowries lead to corrupting influences such as spinsterhood and heavy debts on the couple. They may also prompt the husband to harm his wife upon divorce to compensate for his losses. Therefore, it was part of Islam's guidance to lighten the burden of marriage expenses. You must advise with wisdom and dialogue to persuade your father to abandon excessive dowries, while considering benefits and harms and avoiding anything that leads to marital failure.