Can the Previous Owner buy back the house?

[Jason Genovese]

I purchased a foreclosed house from the court house steps and now the previous owner want to repurchase it from me.   He originally owed the bank $80,000 and I have agreed to sale the house back to him from $35,000.    He has came up with $20,000 and says he can raise the other $15,000 in a month or two.

I was wondering if he can legally buy the house from me since he was foreclosed upon?