My mom is 75, a mental patient. her tenants stopped paying rent. ideas other than legal r welcome?

My mom is a senior citizen and had rented her property in Madurai to a reputed organisation. Two years ago, due to health reasons, she moved to stay with me in Mumbai. Immediately her tenants stopped paying rent. Despite repeated attempts, they neither pay rent nor are ready to return the property back, what to do other than legal procedure-which is very time consuming apart from being expensive. Please give good suggestions to deal with this problem.