Can someone break lock of my house. Is it authorised or illegal?

We live in joint family (our family, uncle's family & one more unmarried uncle) and earlier used to live in kaccha house which Grandfather made in West Bengal. My father and his brother then build pakka house together by keeping the kaccha house beside. As due to my father job relocation we need to relocate different state. So we were given one room from that pakka house out of 4 rooms. But later in 2019 they broke the lock of that room and shifted all our things to kaccha house. My father didn't fight as my uncle health was not good, so he kept silent. Then whenever we were visiting our village we were staying in kaccha house. But today (7-6-24) we saw our lock in that kaccha house was broken, will all our suitcase lock was also open. Is it authorised or illegal, what step we can take. For property partion my uncle son always call and shout and blackmail to my parents for partition. Partition area also they has selected as per there choice. My father from starting to 2011 use to give 50% salary to them. Today my father don't have enough saving also to make again new house or fight case. Please help any suggestion what to do.