How is Steve Irwin related to Ashton Irwin?

Steve Irwin, the renowned wildlife expert and television personality, and Ashton Irwin, the musician from the band 5 Seconds of Summer, are not directly related. They share the same last name, but there is no known familial connection between them. Steve Irwin was Australian, famous for his work in wildlife conservation, while Ashton Irwin is also Australian but is primarily known for his music career.