Question 3 Nintendo switch consoles. 1 house.

Mar 3, 2020
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If this has been posted/asked before I apologize. I looked and couldn't find it.
Here's s the question
We have 3 Nintendo Switches and I'm wondering if my kids can play my games I've bought on my system?
I've gotten it to work on one but I can't seem to get it so both children can use my games. It's like either one or the other. I understand the "make this your primary" console stuff but it only seems to work with 2 consoles at once. Does anyone have experience with this? Thanks.