Are the children entitled to claim their share of the gold that their mother gifted to her daughters before her death, knowing that she was in full possession of her faculties, and are they entitled to claim its value at today's price, 15 years after her death?

A mother's gift of gold to her daughters during her death illness is considered a bequest to an heir, and it is not enforceable unless the other heirs consent. The silence of the heirs does not signify consent unless there is an indication to that effect. If their silence is not due to consent, then they have the right to claim their share of the gold, and their right is not forfeited by the passage of time. If the gold is still in existence, they can take their share of it or demand its current value; and if it has been sold, the daughters must return its equivalent. These issues are resolved either by mutual agreement or by resorting to the Sharia court or to people of knowledge.