Desceased Father w/ No Will

Father died 16 ys ago at young age and did not leave a will. He and my mother had just divorced. His side of the family cut off contact w/ us. (me, my brother and sister). Last year we recieved a bunch of stock certificates that my dad had purchased thru his long time employment w/ HP, from a lawyer. my uncle had had them and tried to cash them in, but the lawyer said they were legally ours and sent them to us. There are more of them and who nows what else that side of the family has as well. How do i go about filing a probate so thaty me, sis, and bro can legally inherit what dad did leave lying around???? Do i have to spend $$ on a lawyer or can i do this myself???
Thanks

[Law200]

You can try to get them to voluntarily cooperate; but if they will not do so then you will need counsel.

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