I would say that raising the last or youngest can also be a challenge, parents can tire out to the point that they will let these children do and get away with more things then the first child they may raise.
Or they may adjust to a more tolerant attitude , when really since the world is getting worse in peer pressure and bullying
There is no place to slack up on parenting.
But be their for them till they can take care of them self
We either do our responsibility or the world will do theirs .