very good advice from all, but I would seek legal counsel on this matter.
If the owner is not paying the mtg with your rent, you could escrow it, otherwise my best advice
is to be quickly looking for another place to live.
Once the foreclosure sale is in process, one day the Sheriffs Dept will show up on your doorstep and throw all your stuff to the curb. Because YOU ARE NOT the owner, you may not know when this is going to happen. I've had to do this before, and if there are children involved, it is not fun ;(
If I were you, I'd find another place to move asap. Not sure where you are, but if you want some help, let me know and I'll put you in touch with someone that can help you, Whatever you do, do NOT wait - as the mtg company does not have to inform you of what is going on. You may just show up from work one day and see all your stuff at the end of the driveway and the locks changed. .