Help I need advice! Should we refinance our mortgage to pay for prepaid college tuition for our 4 children?The facts: 4 children entering college in the next 4 to 10 years. Only college savings we currently have is custodial accounts for the older 2 kids funded by grandparentsHouse is worth $150k. Current mortgage is @7% - due to be paid off in 5 years. (Orginal amount borrowed was only $41,000). We plan to stay in this house for the next 15 years -- until all the kids are through school.IS this a good plan?