Tax Sake Excess Funds To Step Child

My mom passed away 4 years ago and my step dad lost the house to a tax foreclosure 2 years ago. Taxes owed were only around $1400 and it sold at auction for $14,000. I am currently buying the house back from the current owner, and he told me I should look into if I could get the excess funds from the sale.
Does anyone think I would have any chance in receiving that money? There was no will left by either of them. So I’m not sure I would be entitled to the funds since the last “owner” was my step dad, I was never adopted. The house is in Michigan.

Thanks for reading.