Does B2 get any right?

F and M were a maried couple. They has three children - two sons S1 and S2 and a daughter D. Now S1 is 20 years old and S2 is 18 years old and D is around 13-14. F had his own business in a shop in which S1 and S2 works. F retired due to old age. But S1 and S2 didn't like each other very much and they decided they couldn't work together. So F decided to make a partition and divide the shop in two parts. B1 gets one part and B2 another. D got an office job a few years later. Now, B1 and B2 are 62 and 60 respectively. They are doing business in the same way till now. D has retired from her office job. Meanwhile F passed away without making a will. Now B1, D and W want to divide the whole shop in 4 parts so that all of B1, B2, D and M get equal parts. But B2 doesn't want that. B2 doesnt want to leave his part as it was given to him by his father F long ago, though without a will. Now what will happen is D and M would give their part to B1 once the partition happens. They mainly want to do that as they are not in good terms with B2. But B2's share is just way too small to do any business reasonably. My question is can they do that against B2's will? Does B2 get any right over his portion in light of his 40+ years of working there?