Well it's been a while since I've been on Bigger Pockets. I thought I would update this thread for anyone following. I passed on the deal after a little more research (and finding out the daughter had no legal rights of ownership). It was money well saved. The MHP filed abandoned property paperwork with the State and took ownership. My brother & sister in law kept the HMP owners in the loop that they had an "as is" buyer once everything was completed with the State. Long story short - it took a year, but I DID end up buying it (for an amazing cash price!). I actually have moved into the home due to the CRAZY housing prices in Dallas/Ft. Worth right now - which has cut my housing expense by 50% and given me an extra bedroom. To sweeten the deal, I also have an 8'x8' Tuff Shed (about $1,300 at Home Depot) that was included in the sale.
It has taken a LOT of cleaning and airing out due to the previous owner being a cat lady and heavy smoker.
My words of wisdom - keep sharing your experience with others in the Bigger Pockets community. Don't be afraid to pass on a deal - but follow up from time to time. Know your numbers and make the deal work for you! Now...back to some remodeling. :)