Do estate/probate issues complicate foreclosures?

[Konrad R.]

I have been looking through some foreclosure listings. Some list the person's estate or heirs as the defendant. How does this affect a foreclosure process? Would there be any issues after the auction if someone says the home was in probate? Should all of that have been already worked out prior to the auction? Can a house in probate be foreclosed on?

I saw a similar one for a property tax deed sale. The tax payer is listed as the person with the word heirs behind his name. Are there any additional steps in the due diligence process?