Do parent roles change?

I believe they do, because their kids get out of diapers and into school within 5 years. Then middle school comes and they find they're roots for what they want to be when they get older. Then high school comes, the kids are around drugs and alcohol, and could royally mess up their plans for their future. All these parents have to deal with their kids coming home every night from when they started school with different attitudes every year that goes by. It goes from first kiss, to their first time smoking weed almost in an instant. Then the parents are wondering "When or where did I mess up and become a bad parent?" Parenting roles change every day until they're kid becomes an adult, and nothing will ever change that.