My brothers-in-law want to disinherit me

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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 further business in that family since my only connection to them is gone. We were not officially married but we have a daughter. I have an older son from a previous relationship and this is known to everyone. His brothers claim that 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 e.g. matatu’s and they want to throw me out of our home. If they succeed, I will be left without any source of livelihood because I depend on these businesses to survive. What can I do to stop? {Jackie}