Yes True, Brock's father's name is Flint and he was the former Pewter City Gym Leader and he later passed that title onto Brock, After Brock's mom died his dad had to watch over the rest of Brock family(all of his siblings; which is alot of people!), Flint first appeared in season 1, Ash first encountered him outside of Pewter City while he was selling merchandise, Flint reclaimed the title of gym leader after Brock left.
參考: May's and the brother Max; their dad's name is Norman, he is in the games and the anime, he is the leader of Petalburg Gym, his pokemon are Slaking and Vigoroth, he fights with brute strength and balance, also Max idolizes him and he plans to follow his dad's footsteps and earn the title of Petalburg Gym in the future, May also views her dad as an influence.
I Am a Pok'emaniac:D