Harrasment by parents

I am the elder son of the family 30years old, my sister is the younger sibling 20years old and she is now in college. I have been married in 2021. My father was a high ranking officer in Central government when retired in 2016. He has 4 properties worth almost 3crores. Also a lot of bank balance, shares gold jewelry and mutual funds. He also earns a hefty amount in pension. Now 3 years back when I married, he only gave me 3.5 lakhs and a gold necklace of 50grams to my wife. He told me he will have to save money for my sisters future studies, since she has very poor academic record. He also told me he will also have to save for her marriage too. After marriage he gave me and my wife one of his flats to live. My in laws decorated the flat for us to stay. However We lived there for 2years and left for UK last September. Now my parents are telling me that if we don't send them money back from London they will throw all my belongings out of that flat and threatening that he will not give any of his properties to me. He never spend any money on me during my higher education as well since I studied in government college with scholarship and used to do tution to provide for my hostel fees. Finding it difficult to concentrate on my work. Need suggestions