Who should I contact when owner is ".... [name] ESTATE OF"

[Donny Widjaja]

Hi BP members,

I am looking at a property that is owned by an "estate", for example: "[name 1] % [name 2] estate".  

Based on my research I believe that property is an inheritance (probate).  I talked to the person listed in "name 1" and found out that he has relatives. 

Is the person whose name listed in the tax lien (in this example, "name 1") is the sole owner?  I believe we can't base it on tax lien only since the official owner is the person who hold the deed, correct?

I asked "name 1" about the other relatives but he has not been in touch with them for more than a year, and he lost their phone number.  How can I figure out who are the legal owner(s) of this property?  Can I try to ask him to sign the contract first while hunting down the other relatives?

Thanks for all your help