Disowning daughter

My daughter was married few years back & has a kid (8years). In November2019 she came back to us saying her husband beats her. Few months from then, She introduced us to a friend,(separated from his wife),saying that he wants to marry her. He seems to be good guy at the time. We were all happy that now she'll be happy. In nov 2020, we came to know that the guy is not divorced & the tables turned as we found out that our daughter was having another affairs. Their were 2-3men at the same time. Now we want to disown her. She still talks to the same guy & when we said No she threatens us saying that she'll commit suicide.Her kid wants to go to his dad & the dad agreed to have him. Also we needed some money for our sons marriage so she offered help saying we'll have a gold loan keeping my jewellery in the bank. We are paying the installments & is ready to return all the gold to her if she asks for.So the problems are :- 1. Character less daughter & wants to disown her. 2. Her son wants to go to his dad now. 3. Her jewellery, which we are ready to give her back. Can you help what steps to be taken...