Big Daddy, it would also be helpful if you would please write in complete sentances, using capitalization and periods. I'm going to try for you:
Dick and Jane's name is on the deed to house because Dick and Jane paid $22,000 for the house. Dick, Jane, Sally and Jim's names are all on the deed to the house. Sally and Jim are Jane's parents. Jim (Jane's father) has a mortgage on the same house. Sally's (Jim's wife and Jane's mother) name is on the truck.
Jim has died with no assets. (Although your post indicates that Jim's name is on the deed, so the truth of the matter is that he - and now his estate - has some ownership interest in this house).
Is that correct? If so:
Truck: the truck will be repossessed if no further payments are made. Sally may be sued for the amount due on the truck. Sally's interest in the house may be effected if there is a judgment for the amount due on the truck. There are several IFs: first, Sally would have to be sued; there would have to be a judgment; and there would have to be no exemptions in NJ which would protect the house.
House: if no payments are made on the mortgage, and/or the bank figures out that Jim has died, the bank will repossess the house.
Short answer to confusing story: someone needs to open up probate and properly deal with all these issues.