Private Lending question

[Greg Kimura]

After much thought and family discussion, we have decided to lend my sister money on her home.  I was in the banking industry for about 8 years and I know a bit about writing the loan contract.  The part I need help with is making sure I am second behind the her first mortgage.  I've heard that I need to file with the state/county, but I'm not sure what I need to do.  Has anyone here done this and if so, what is the process.

I appreciate your help.

Thank you.

Greg