At the age of 17, Lemmy met a holidaying girl named Cathy. He followed her to Stockport, where she gave birth to his son Sean, who was put up for adoption. In the 2010 documentary film Lemmy, he mentioned having a son whose mother had only recently reconnected with him and "hadn't got the heart to tell him who his father was". Later, during his time with The Rockin' Vickers, he slept with a woman in Manchester named Tracy; she had a son, Paul Inder, whom Lemmy met six years later. As an adult, Inder became a guitarist and occasionally joined Lemmy onstage.
The 2010 rockumentary film Lemmy was directed and produced by Greg Olliver and Wes Orshoski. It consists of a combination of 16 mm film and HD video footage, produced over three years. It features interviews with friends, peers, and admirers such as Dave Grohl, Slash, Ozzy Osbourne, James Hetfield, Lars Ulrich, Kirk Hammett, and Robert Trujillo of Metallica, David Ellefson of Megadeth, Scott Ian of Anthrax, Alice Cooper, Peter Hook of Joy Division/New Order, Dee Snider, Nikki Sixx, Mick Jones of the Clash, Ice-T, Kat Von D, Henry Rollins, Lars Frederiksen of Rancid, Jim Heath of The Reverend Horton Heat, Slim Jim Phantom of the Stray Cats, Mike Inez, Joan Jett, pro skateboarder Geoff Rowley, pro wrestler Triple H, "Fast" Eddie Clarke, Jarvis Cocker, Marky Ramone, former Hawkwind bandmates Dave Brock and Stacia, and Steve Vai.