Absolutely. It being exempt from creditors is a main benefit of qualified retirement accounts.
Not "absolutely." Properly established IRAs are protected up to one million dollars, and a bankruptcy court can extend that higher. Any money that you withdraw from an IRA, unless it is all placed in another IRA or a 401(k) or other qualified retirement plan, is not protected.
Get professional help NOW. Your IRA is exempt, doing what you suggest only would mean you could lose it, and the house, when losing neither is actually possible.
Yes he can file for Bankruptcy if he wants to depending on the situation of his property.
Chapter 7 is a liquidation bankruptcy, you are giving up your assets. If you want to keep your home and car you would need to file a Chapter 11 Bankruptcy.
yes
Yes.
yes
NO
It depends on which "chapter" of bankruptcy you file. I suggest you speak with an attorney to see what you can do.
If you file bankruptcy, you file bankruptcy on everything. You can not file bankruptcy on one loan.
No
Yes, as long as you keep making the payments.
Generally ten years from the time of the last (closing) activity of the said bankruptcy.