Uncle sold father's property how can I claim my share

My father died in 2010 after which my uncles split the property among themselves without giving me and my mother a single penny. My mother separated from my father when I was one year old(no divorce), since then we live separately. Now my uncles have sold my father's share of property. I know that I am a legal heir to my father's property but how can I claim it. Moreover now that they have sold my father's property, what action can I take legally? and how?