Should I tell my brother and sister-in-law who just had a baby to pull their heads out of their asses
I hope you are joking. Could you tell me the reason behind that?
Because they are always neglecting the baby for other things
You should tell them to be more responsible. It's important that they do their parental duties.
Nah, they need to learn it the hard way. The world is a tough place just like this.
I guess if they are neglecting the baby, you can also call the authorities and have them make the proper assessment. This will really be the "hard way" that you are talking about. It should give them a wake-up call to make sure they are responsible parents.