Parent-in-laws getting harrased by daughter-in-law and her family

Im the elder daughter-in-law writing on behalf of my parent-in-laws. My parent in laws are above 60 years, they got my brother-in-law married on 18th Nov 2015. After few months of their marriage they had some disturbances later in january this year they both were saperated from our parent-in-laws Home. The disturbances still continued which rose into police cases this year from both ends. Now as the 498 case was on my brother-in-law, parent-in-laws, myself and my husband, our parent in-laws didn't allow her to enter the home till the case gets a decision from court. She then barged into my in-laws house breaking the locks of gates, doors in their absence on 19th August 2017. Now not allowing my parent-in-laws to enter their own earned property. My co-sister is also abusing me over whats-app blaming me into false allocations. My parent-in-laws need support which they are getting from police or any. Is there any guidance/support we can get so that we can save our family from the people like my co-sister and her family. We are in need to support. Thanks and Recards,