Additionally, Lesh and his wife Jill administer their charitable organization, the Unbroken Chain Foundation. The couple have two children together, Grahame and Brian. Both Grahame and Brian follow in their father's musical footsteps. The three frequently play together both publicly and privately, for example in an annual benefit concert grouping known as Philharmonia, dating to 1997, most recently on December 18, 2011 at a Christmas gig including Bob Weir and Jackie Greene at the Tenderloin Middle School cafeteria attended by 250 people.