More details needed
What is your household income?
Do both you and your spouse work full time?
Kids and their ages?
What are your debts?
House: what is it worth and how much do you owe, what is the monthly payment?
Cars: what are they worth and how much do you owe, what is the monthly payment?
Credit cards: how much do you owe on each one, how much are you paying? List them out.
What are you spending each month on groceries, gas, utilities, clothing, restaurants, entertainment, hair and nails, gifts, kids tuition or activities...what else?
I find it hard to believe that you have been paying on your home for 18 years yet have no equity in it. I also have trouble seeing how staying in a 4000 square foot house is going to be a viable option if you are truly facing bankruptcy.