Super Mario Run parent/child DLC sharing?

I just bought the level pack in Super Mario Run on iPad for my kid. He's logged on to his own Nintendo Network Id, which is a child account registered under my own NNID. I'd like to play this game myself as well (preferably on my phone, as soon as it comes out on Android) using my own NNID. Will I have to buy the game again under my own Nintendo Network Id?

I've seen other questions about sharing DLC between devices but they either assume you're using the same NNID or the same Apple id.

Solution 1:

To answer my own question, I had to buy the game twice. Each NNID holds its own DLC, I was not able to reuse this even though the accounts are linked together.

This is sort of what I expected, but not what I had hoped :)