Dear Sir,
Your questions are answered as below:
Question 1- Is there any provision in law that can force sale and equal division of the property among all brothers and sisters? If yes what is the process?
Ans: First you have to file partition suit. If it is decreed then you may file an application for division of property. If division of property not possible then one or more of the parties will be asked to purchase the share of other sharers. If no body is willing then court may arrange for sale and distribution of price received. Such decree may be decreed by mutual consent and court cannot by force sell the property.
Question 2 - Can my father lawfully lock couple of rooms in the house?
Ans. No. your father cannot lock coule of rooms but take the permission of the Court to restrain others from selling the property till case is disposed.