Despite being raised by his father, Lucius, Lucas Fox felt he didn't have a purpose in life. Even joining the army in an attempt to find purpose. Ironically, true purpose came in the form of crimefighting when Lucius was almost killed by the Heretic.
Donning the now vacant Batwing suit, Lucas went into action, and became and integral part of the Batfamily soon after. He helped take down Leviathan, and then had numerous other adventures with both Batman and Lucius' blessing. He is the current Batwing, and that looks to continue.