You don't sound sunk at all.

You have $70,000 in home equity. Only use that as an absolute last resort.
If you have $50,000 or close to that in unsecured debt, I'd file bankruptcy. The problem with the consumer agencies is your credit gets dinged about as bad as filing bankruptcy.
Before filing, I'd refinance the house if possible, but not take any more mortgage on.
I'd dump the cells asap and go tracphones.
Sign the kids up for the house leagues, town leagues, whatever are the cheapest. Maybe join a YMCA -they have financial aid and it's not income based, but your overall financial situation.
Don't worry about your 16 year old not driving yet. If hes not driving by the time he's 20, then you can worry. Most car accidents happen to kids between 16-18 anyway. All my kids got permits at 16, but didn't get licenses until they were 18 or older. Some of their friends who got them earlier got in accidents, totaled cars and ended up not driving until later anyway. Only one out of my three got in an accident and it was someone running into him when he was 19.
If you're not already doing it, cut Coupons for groceries.
You don't have to go all TLC coupon crazy, but I save 25% average off my grocery bill.
When you eat out that one time a month, make it a cheaper restaurant, preferrably one that offers decent discount coupons or specials.
Advertise for night babysitting-some people need third or C shift sitters and not many people offer that. Even 2nd shift if you'll be home. If you love kids, it's not a bad way to make some extra cash.
Shop for clothing at consignment shops.
Go to a church food cupboard, or a town food bank. They don't usually ask for proof of income, at least they don't here. You could cut your food budget a lot if you visited one of these three or four times a year. You'd be in good company, as it's not just for the poorest of the poor any more. I went with my friend one time and another time they delivered the food right to her house. She was so thankful.
If you have medical bills, try to negotiate with them to lower the balance.
We've had to do everything above except file bankruptcy due to high medical bills and dh not being able to work. Our income has dropped about 60% from before he was diagnosed.
If the hospital had not forgiven one very high bill, we would have had to file bankruptcy too.
It's amazing what we do without and not really miss it. Right now I'm trying to figure out a cheaper internet alternative. I have paying $40 a month for it.
As far as the vehicles go, maybe your dh could barter his skills for a mechanics skills. dh used to do that all the time before he got sick.
Now, not so much, but we're lucky to have friends who fix cars, do plumbing, electrical, carpentry, etc. I don't know what we'd do without these friends since our house is 40 years old and falling apart.
Good luck on everything and know that even though it feels like it's really bad, it's really not. Try to look at it as a challenge, not as a defeat. A temporary glitch that will soon be fixed.
