Team president and majority owner Hank Stickney said Tuesday the sale of the Class A affiliate of the Los Angeles Angels is expected to close this summer.
The deal is subject to the approval of the California League, Minor League Baseball and Major League Baseball.
The Brett family has a long history of owning minor league teams. The brothers lead ownership groups that control the Spokane (Wash.) Chiefs of the Western Hockey League, the Bellingham (Wash.) Bells baseball team of the West Coast League, and the High Desert Mavericks, another California League team.
Also, Bobby Brett leads an ownership group that owns the Spokane Indians, while George Brett leads a group that owns the Tri-City Dust Devils. Both baseball teams play in the Northwest League.
"The Rancho Cucamonga Quakes are one of the premier franchises in Minor League Baseball and we are excited about the future of this organization," said Bobby Brett, who will serve as managing partner. "The stadium and community are terrific."
Valley Baseball Club Inc. has owned the Quakes since the team moved to Rancho Cucamonga from San Bernardino in 1993. The team has led the California League in attendance every year of its existence.
The Quakes open the season on April 9 on the road at Inland Empire.