Would you sell your second house if it was the only way to save yourself from financial collapse?

There's no other way. If my parents sell their house (it was formerly my paternal grandparents' house) in Rancho Bernardo, CA, then the only debt remaining, besides an auto loan, will be $210,000 in principal left on the mortgage on the home in Roseville, CA. Together, they make between $9500 and $10,000 a month. There's a home equity loan on the Rancho Bernardo house, but it is NO WHERE near under. It's not that hard to listen, I'll be very clear, there is ONE home equity loan on that house and that's it. The monthly payment exceeds the rent check, even before expenses.