Bri is an old hand at staving off attacks from Boss Cass, so it should be no surprise that both of his boys grew up to follow in his footsteps. His fighting days are over so he makes himself useful by providing the all useful rangs to his sons.
He is the father of Betty, Ty and Sly and husband to Di. Some time before Ty 1, he fended off Boss Cass' attempts to steal the talismans. Boss Cass was able to activate their power long enough to seal the thylacines in the Dreaming, but Bri used his boomerang to scatter the talismans to keep them out of Cass' hands.
(When ordering his sons to attack Boss Cass) "Now!"
(When Ty buys a boomerang) "Saves me having to get you one for your birthday, son.