Does less valued property avoid probate?

[Mike]

My grandfather died in 1978 with no will and there is property in the desert that my dad lived in for 30 years and has since passed away, I take care of the property taxes and the property, My grandfathers children do not want anything to do with it and they want me to have it, I need to get it out of my grandpa's name. The value was less than 20,000 when my Grandpa died what do I need to do? I am in California