Following his marriage break-up, Williamson formed a relationship with a new partner, Meg Doyle, who organises some of his activities. The couple divide their time living together between Springbrook and their Sydney apartment and were married in March 2013. His daughter, Ami, is also a musician, who has toured with Williamson. In early 2008, she toured Australian Defence Force bases in Iraq and Afghanistan to play to troops: she appeared on two episodes, "Show of Force", on "Australian Story" (May 2008) describing the tour. Williamson also appeared on the same episodes he had advised his daughter "to sing stuff that's going to be good for the boys". Ami explained her motivation for going "I've got, you know, a history of entertainers in my family ... have performed for the military, my dad has, so I feel like I've taken the baton, which is cool".