Buying my parents house "subject to"

[Josh Ledbetter]

Wondering if anyone has ever bought their parents house "subject to"?

So my parents are wanting to build on my property to be close to us and we are going to build it for them and just rent it to them. In exchange, they will sell/gift us their current residence. This way it keeps their mortgage costs the exact same and I'm still able to cashflow off their residence. Any ideas/thoughts??