special treat

While Papa neglects parental duties yet again due to studying, the kids get a sugary substitute which they appear to largely prefer to their Dad.

Kids, this exam is a very, very difficult thing for your dad to do.  It is hard to study and work and be a good, full time parent.  It's hard material in any case.  But it is one of the most rewarding things I have done too.  I hope when you are older, you take on things that scare you.  I hope you take on things that make you risk falling flat on your face.  It is only when you risk that you can know what you can actually achieve.  Or to put it in our little secret language:  Qui ne risque rien, gagne rien!  Go for it!  Don't be safe!  Don't just do the stuff you are good at or can do easily or you will trap yourself into thinking that is all you can do.  I did that for a long time and it was a big mistake.