My brothers-in-law want to throw me out

My brothers-in-law want to throw me out

My husband passed on last year from a road accident. Since his death, I have known no peace from his brothers who say that I have no more business in that family since my only connection to them is gone. We were not officially married, but had a daughter. I have an older son not fathered by my late husband. My brothers-in-law claim if his property is left with me, I will give it to my first born son who is not part of their family.?They have taken over some of his investments such as matatus and they want to throw me out of our business. If they succeed in this, I will be left without any source of livelihood because I depend on these businesses to survive. What can I do to stop them?