Matrimony and Residential Rights

My Husband works in Chennai but his permanent residence is in Calcutta. The property belongs to his parents. I am living in Lucknow past 4 years separate from my husband with my minor kids alone in flat gifted to me by my parents and this property is under my name. We had issues had legal rustle but it got settled around 4 years ago in Chennai High Court. The divorce and all the charges were quashed on mutual agreement for our kids betterment. However after that my husband stopped paying the rent of the house where we lived in Chennai and moved away. Since I was not working I had no choice but to leave and come back to my parents house as my husband stopped all contacts with me. Then my father gifted me this appartment where I live with my kids till date. 3 years back from now I finally got in contact with my husband where he agreed to pay for kids school fee and cover daily expenditure. He also came to visit us the same year and we came physically close. His visit was the following year as well both at the times of kids birthday and we had physical relation then too. This year he came and stayed for 3 months gave me all respect as wife but we fought and he moved out to his residence in Calcutta. He also threatened me to not to be in contact and he will not pay for kids maintenance and household and stoped all contacts with me. I returned to my parents they said they will not help me either cause I kept from them that I came physically close to my husband. I called my parents-in-laws and they said you have no rights to enter their residence in Calcutta as it is under my mother in law's name. But told me to hand over the kids and return to my parents house. I want to be with my husband with kids but I am not sure. If, I go to his Chennai place he will again leave me alone and will not pay house rent. I would be insecure with kids to take care. And The matrimony house is under my mother in law's name which she has told that I am not allowed to enter. I am also not sure during this Covid time if I go with my kids, will they let me in or not. I am not sure about my rights. I want to protect my family from breaking. I want to live my life with my husband and kids but My husband is constantly manipulated by my parents in law's. Please suggest a legal advise where I can protect kids and my rights from this uncertainty. Thank you!