Parashuram killed his real mother and then mow down the whole Hehey dynasty. After several years later at the Dhanush Yagya, Shree Ram himself praised Parashuram.
Now what I want to discuss is whether we should blindly fallow our parents or we should give them a lesson too, if they need it?
I think if only being elder has been a proof of being correct then we would have still living in the stone age. Elders have experience and that can be a advantage sometimes but not always. You might have heard the proverb "Doodh ka jala chhach ko bhi foonk kar peeta hai". Many times bad experience make us a coward and stop us to experiment with life which can give us a positive direction too.