If You Like Funk: Check Out Vulfpeck

This one may make the "old audio funk dudes" cringe, but may be more in your sons’ repertoire:

Pigeons Playing Ping Pong. (start with the Psychology or Pleasure albums, if they haven’t listened prior)

BTW, great to hear that you are enjoying ’Crazy Mongoose.’

I'm always fascinated by what Roon picks on the radio when an album finishes. I just finished playing (again) Tower of Power S/T (thanks @shadorne) and Roon selected "Vein Melter" from Herbie Hancock's HeadHunters album relating it to TOP's "Just Another Day." I've included both below so you can decide whether you think they belong together:
Just Another Day
https://www.youtube.com/watch?v=O2g8nOuTYLo
Vein Melter
https://www.youtube.com/watch?v=mZy7v_-ss74  

I just finished listening to Lettuce's (2008) release called Rage!. If you like your bass front and center this is the album for you. I'm a bass fan, so it really worked for me. Although released in the last 10 years this album has a lot of the 1970s built into it IMO.
Happy listening!
Regards
Al

Vulpeck has a wide range, but to me, they definitely lean towards r&b/soul/funk.  A few examples:

https://www.youtube.com/watch?v=jRHQPG1xd9o
https://www.youtube.com/watch?v=AWBUnr0F3Zo
https://www.youtube.com/watch?v=r4G0nbpLySI
https://www.youtube.com/watch?v=le0BLAEO93g

I hear many influences in Vulfpeck: Hall and Oats, Marvin Gaye, Jackson 5, ToP.  If you enjoy those artists, (with a heavy dose of very good bass playing), I'd give them a chance. 

A talented and tight young band, in my opinion.

If you like New Orleans funk with a heavy Hammond B3, check out Pappa Grows Funk.

….OK, I finally got around to listening to Vulfpeck, thx to the last poster.  Wow, I couldn't make it through more than a minute of any of those 4 videos!  They sound like a high school band playing what they think passes for Funk.  Sorry, but I wouldn't even recommend that to a youngster.  Needed to cleanse my pallet with some 'Old Man Funk'!;) 

Hiram Bullock - https://youtu.be/6N83_V5lMlQ
Chaka - https://youtu.be/G8xVIcVjYPM
Calvin Richardson - https://youtu.be/cttOHTXuaZM

…..aahhh, that's better!