But MP didn't sign N2N, the record label did. Same for show promoters and the rest. It is not like MP works on the labels or has an agency to book tours.
MP exposed (promoted) his son band, but those in POWER could still have said no.
Just because people could turn things down doesn't mean nepotism wasn't in play, there is an option to say no to basically anything.
I'll give you some direct examples of how MP was in direct control of things. Progressive Nation at Sea, many band conflicts, two of my big ones came on the final day when I had to choose to see Anathema OR Haken, Riverside OR Spock's Beard. Wouldn't you know both of Next to None's gigs were at times when no other shows on the ship. I'll give you one guess who had a big hand in scheduling that.
Shattered Fortress at Irving Plaza in NYC, Next to None opens the show. Sure, without Mike's influence there is an outside chance they could have gotten on anyway, but it's clear that when Mike's people booked the show it was written into the contract they'd have choice of opener and already knew who it would be. Yes, Irving Plaza could have said no deal, but no one was going to nuke what ended up being a sold out show over that.
Steve Harris does the same thing. Lauren Harris would never be opening for Iron Maiden without his direct intervention. Raven Age was at least in the genre ballpark, but you can't say that's not nepotism considering other recent opening acts are on the level of Dream Theater, Alice Cooper, and even Bullet For My Valentine.
Again, it's fair to argue that these folks should use their influence to get their kids ahead in the world, but it is clearly textbook nepotism.