Daughter And Son-in-law Pressurize For Money

In-laws of my daughter were arranged marriage by lying and hiding the truth of son-in-law. After a few years of marriage, they demand money in the form of a loan as they made me an emotional fool and in the sake of help I gave them too. But now it is being continuously demanding from 5-6 years and abuses if not given. I had also given 4 lacs to them to buy a house but after 2 years, they sold it too and start demanding again. And now they are homeless. In-laws of daughters are not supporting them. Even now I am paying their rents since 1 year. And my daughter not allowing me to do any legal action against them. And I am financially not able to support them. What should I do? Give me some legal advice.