My top Whatever, Flow etc etc

Hi all, 

I have a family plan and I’m the lead user. However, I am finding whenever I want to flow My music or play My top whatever, songs from my family’s playing history are being included. As we all have different tastes in music, this is annoying (first world problems, I know). 

Any idea how I can ensure that none of what my beloved family are playing will influence my music? It doesn't appear to be happening the other way round as their accounts seem quite private and unconnected to mine. 

Thanks for reading.