Okay - this one is a little bit of a stretch.
Jerry Lewis (he "sang" as half of the comedy act Martin & Lewis with the crooner Dean Martin):
and son Gary Lewis (and the Playboys):
I wanted to use John & Bonnie Raitt (he was a Broadway star; recorded cast albums but didn't really put out any singles), but I figured I already stretched it a bit with Jerry & Gary Lewis.
A bit of a stretch but Maya Rudolph has dabbled in music for many years. Her mother was Minnie Riperton. 'Looooving YOUUUUU...is easy 'cuz your beautifuuuulll. Do en do do do dooooo...AHHHHHHHHHHHH....'
Side note saw Dhani's band open up for someone several years ago, and between sets him and his band walked through the lobby as I was getting a beer. Just blew my mind that George Harrison's son was right there.
Les Paul-Rock & Roll HOF inductee for the invention of the solid body electric guitar is Steve Miller's Godfather. He was also Miller's guitar teacher.