The bank has it's lawyers send this letter that has the total amount owed plus late and legal fees. The person must pay this amount by the date specified to "keep" the house and become current.
If the payment is not made, the foreclosure process will start. It will depend on the area and how saturated the courts are with foreclosures as to how quickly a sherriff's sale will take place. If I remember correctly, once the house sells (usually an auction on the court house steps) the family has to be out with a minimal amount of time, like that day or 24 hours or something.
If there is no bankruptcy, the family COULD have their paychecks garnished for the difference of what they owed minus what the house sold for. I don't know if the banks and courts have kept up with this part of it and a lot of people are walking scott free.
They need to talk to an attorney who knows about foreclosures. A bankruptcy attorney will generally advocate a bankruptcy....that is how they make their money.
Could they get rid of some other bills and come up with enough money on the short hand? Do they really want to keep their house? Can they really afford it with the type of lifestyle they want to live?
Some people need to learn the hard way and it sounds like your friend might be one of them. You can't feel sorry for people who make bad choices (constantly).