Is it permissible to give the fetus's blood money to the mother and siblings, or to donate it as charity? What is the amount of one-tenth, and is 213 grams of gold the amount of the blood money?

The blood money for the fetus is a right belonging to the heirs, and your responsibility is not absolved except by giving it to those who are entitled to it or by their forgiveness. It can be delivered by any method. To know its amount, which is one-tenth of the full blood money, you can refer to the general determination of blood money and consult specialists to ascertain whether the mentioned gold is equivalent to the ghurrah. As for the judge compelling you to divorce, it does not nullify the heirs' right to the fetus's blood money.