While it can't be denied that who Zak's dad is a big secret, it's not something he's made a big thing of. He can do nothing if something gets printed mentioning who his father is, or if some people are aware of the connection. I have had plenty of friends over the years who, when watching him with The Who or someone, have been totally unaware of who his father is until I've pointed it out.
As to whether it is possible for the Beatle children like Julian, Sean, Dhani and James to pass under the radar and release material without ...