The Flynn family formed the lobbying group, Flynn Intel Group, which provides intelligence services for both individual businesses and the government. While Michael Flynn is the CEO, Michael Flynn Jr. acted as the Chief of Staff for a period of time. At this time, it does not appear as though Michael Flynn Jr. has a wife or children, though he seems to be following in his father's footsteps by joining the military and getting involved in politics.
Matt Flynn, on the other hand, has not gotten involved in the family business, instead focusing on his own family. He has a wife and two children, who he posts about frequently on his social media accounts.