Is it permissible for a father to write over his properties to his daughters out of fear for them, given that his money is intermingled with his working wife's money?

It is permissible for a father to gift his property to his children, provided there is justice among them. The gift becomes binding upon the children taking possession of it during their father's lifetime and disposing of it as an owner would. Otherwise, it transforms into an invalid will for an heir unless the remaining heirs ratify it. It is not permissible for a father to gift what he does not own from his wife's property that is mixed with his, without her permission. If the parents' properties are mixed, the gift is valid upon the donee taking possession, and the donor relinquishes control over it. Some scholars hold that possession of undivided property is not valid until after division, while others consider the partner's permission in it to be valid.