Hank Lang had difficulty relating to his son and during the latter's childhood often let his wife resolve issues and comfort him, not understanding how to console Charlie himself. When Charlie came home crying after being bullied, Hank awkwardly stood outside his son's door waiting and hoping that he would tire himself out. Despite seemingly not taking any action, Hank still cared about his son's well-being.
In 2015, Emily Lang's cancer became terminal and was admitted to San Francisco General Hospital. Hank sat in depressed silence at her bedside, never leaving and not even responding or reacting when his son came into the room, looking on as mother and son exchanged parting words on her deathbed. However later in the evening, Hank went looking for Charlie in an attempt to talk to him and console him. The two of them met together on the rooftop of the hospital and awkwardly sat next to each other in the night, before finally beginning conversation. Grief stricken and emotionally compromised, Hank made Charlie promise that he would make his mother happy, and then embraced his son, telling him that he loved him, something that appeared to be not entirely common in their relationship.
In 2020, Hank and Charlie Lang shared a drink on the latter's 21st birthday on the boardwalk at Aquatic Park Cove. Hank apologized for making his son make the promise, noting that he was not in a clear state of mind when demanding it and acknowledging that he was being selfish. He encouraged Charlie to find his own path to a fulfilling life, and asked him if he was sure if he still wanted to be a wizard, to which his son replied that he was certain.
In 2021, Hank attended his son's graduation. When Charlie was accepted into the United Liberators Operations Academy, Hank was extremely proud, and would often brag about him to his coworkers and friends.
Hank is a quiet man who usually keeps to himself and has trouble connecting with other people, save for Emily Lang who he had an extremely close relationship. Despite not understanding his son as well as his late wife, he still clearly loves Charlie and wishes him to be happy, as evidenced by his statement on his 21st birthday that he should not be held to the promise that he made his son make five years ago, criticizing himself as being unfair and selfish.