My Three Warlocks

Three Warlocks, brothers, triplets, run a ranch where they train horses for cowboys and cattle ranchers. They use their special powers to keep their ranch solvent and, despite the recent death of their adoptive mother, are content with their lives. All that changes when a pre-teen equestrian shows up with her father to buy a horse. On the same day, triplet witches and their mother are directed to the ranch by a mysterious stranger.
The witch's mother and the girl's father have a history, and only he knows that none of this is a coincidence. Within two days, the warlocks, the witches, their mother, the girl, her father, and some friends and family use their powers to fight a forest fire. They are then recruited by the mysterious stranger, an ancient wizard, to protect a rape victim. The woman was raped by a magical being who intends to steal the baby and kill her.
This wholesale rape of indigenous populations has been going on for a long time, and the wizard believes he finally has the team to stop it. The wizard quickly loses control of the team, and it completes the mission without him. The team takes on missions without the wizard, relegating him to advisor status. After several missions on their own, the team emerges far more powerful than anything the wizard could have imagined.
Even though he created the team, he does not control them and, in some ways, the "battle group" he created controls him.