Any one who has a beneficial interest in the property can ask for it to be sold so that they can have their money, If the other owners do not agree to a sale then it is possible to apply to the Court for an order foricng a sale. However the Court is highly unlikely to order a sale of the property where it is being used as a home for a child of the parties. In other words you will probably have to wait. On the other hand you may be able to do a deal with your ex and her father whereby they buy you out now. Assuming they want to, you should expect to take a discount, money now being rather better than money later.