Do old-school parents eventually reach a breaking point with a troubled adult child?

If their child grows up (18 to early 20's or older) and really hates college, still into drinking heavily, gets fired from jobs, has strike back the parent as an adult and even openly rejects every single religious values they were taught.

What happens if even being raised old-school didn't work and they're still worse as adults? Would they reach a breaking point by then and throw the towel?

Yes, it's time to throw the towel
No, old-school people never give up
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3 mo
I've only heard the good, successful stories of them growing up with carreers and families (thanking their parents for that) but what about the negative, failed stories? What happens there?
Do old-school parents eventually reach a breaking point with a troubled adult child?
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