The challenge with your analogy is that there is a high threshold for an unsecured loan (which an educational loan is). If you did not make the payments on your secured loan (car), the credit union would have just repossessed your car. There is nothing to repossess on a private student loan. Your family would have to be credit worthy each year.
What is your anticipated major that you are going to make all of this money to service 100k in debt? My D has friends that she went to law school with who 5 years out have not obtained legal jobs that make enough to service their debt. Unfortunately many of the high paying jobs are located in parts of the country where the cost of living is also very high. My niece who is single 0 dependents makes $125k/year and was eligible for one of the few NYC housing lotteries for her income level. She recently moved to affordable housing building where her rent is $2700/month (she is happy because the market rent in her building is $4k/month). However, she says when they ran her financials, she would not have even been eligible if she were carrying a lot of student loan debt.
Even if you are a STEM student (engineering), anticipating making 50-65k coming out of college, after taxes and living expenses, it will be very hard to service 100K in debt.