Nanne has been the color commentator for the Minnesota State High School Boys Hockey tournament since 1964, a total of 51 years. His son, Marty Nanne (born October 16, 1967), was selected by the Chicago Blackhawks in the eighth round of the 1986 NHL Entry Draft. Nanne has three grandsons playing junior ice hockey or high school hockey. One, also named Lou, played for Edina High School before passing up his senior season to play for the Penticton Vees. He had signed to play hockey for the University of Minnesota, but decommitted and instead attended Rensselaer Polytechnic Institute. He was drafted by the Minnesota Wild in 2012, but never played professionally. Tyler Nanne, who was drafted by the New York Rangers in the 2014 NHL Entry Draft, was a member of the Edina High School team that won consecutive Minnesota State High School Hockey Tournaments in 2013 and 2014. He played at Ohio St for 1 year, then transferred to the University of Minnesota. Nanne's granddaughter, Erin, works for the Minnesota Wild. Their cousin Vinni Lettieri, whose father Tino, was a goalie for the 1986 Canadian World Cup soccer team, played for Minnetonka High School before joining the Lincoln Stars and is now a member of the New York Rangers of the National Hockey League. Nanne opened "Lou Nanne's Steakhouse" in Edina, Minnesota in March 2016. It has since been renamed Tavern23 as a tribute to Nanne's jersey number.