Upbringing vs.Personal Responsibility

A new singer candidate for my choir: "I regret stopping piano, but my parents didn't make me practice". Hey, that's my line, but I don't buy it anymore. It's so much easier to blame someone else or find excuses than acting upon something we consider important.

I hear adults in their 50 and 60s blaming or praising their parents/teachers/siblings for the way their lives turned out and I can't stop wondering where is that elusive boundary between upbringing and the choices we make. Unlike canned food, upbringing doesn't come with an expiry date. Its impact diminishes with time, making room for personal responsibility. Or does it?