My dad passed nearly two years ago. My middle sister was helping him with his bills when he became I'll, my baby brother (half) was staying in the house. My sister retired and moved to North Carolina suddenly and was gone without much notice. I'm sure she absconded with some of dads financial holdings. How do I find out what the status of the house is ? Was it left to the remaining siblings ? Solely to my sister? Or...

Was there a will and did it go to probate? Who was the executor?

You are not nearby? Who, if anyone, occupies the house?

To directly answer you question, you would find out the status of the house by checking what deeds have been recorded since he is known to have owned it. An easy way to do this is to check the tax assessor's records.