Can I have file a case against my father for home loan property

Two years before me and my brother had started to built new house under home loan for the value of Rs. 25 lakhs. With me and my brother, my father also a holder because of holding the property in his name in the bank. But account main holder is me and my brother because of salary income We have inaugurated the house nearly by an year. Me and my brother peacefully paying the EMI amount to bank. In other than current living house we have owning one small property in name of me. But my father blackmailing to change the will in his name, otherwise he won't let to support my marriage and will stop anything apart of his knowledge. But we are not interested to change the will because of his attitude and arrogance. Now me and my brother marriage under question mark in future. Now he and his relations torturing us to change the will in his name or they will sell the house which is under the home loan currently. Apart from that new home we don't have an home and it will be difficult for our survivsl. Now can I file the case against him to stay the property away from selling the property to anyone .we seek your guidance for further action