If Cassper Nyovest's Family Tree is credited on Spotify as being both a sound record copyright owner and a music publishing copyright owner of some of Nadia Nakai's songs does that mean Cassper Nyovest gets every piece of the pie of music that Nadai Nakai releases under Family Tree.
I tell you what record contracts can be tricky unless you really know the details in the record deal. But from a standard record deal obviously, if Nadia Nakai is signed to Cassper Nyovest's Family Tree that means the record label will be entitled to recoup its cost of either promoting Nadai Nakai's songs from marketing, productions costs, music videos production costs etc.
At the end of the day, one can only speculate unless they have seen what Nadia Nakai's record deal with Family Tree looks like.
But as for music publishing obviously, Nadia Nakai is by default entitled to music publishing royalties whether from mechanical royalties, public performance royalties you name it unless she signed them music publishing royalties to Cassper Nyovest, and I really doubt she is that naive so let's leave it at that.