The Goblirsch brothers' respective junior-varsity football teams squared off at Bulldog Stadium earlier this month.
Clinton and Derrick coach at Ceres High and Central Valley, respectively.
"Obviously, it's competitive," Clinton said. "I want to win. He wants to win. It's fun because it's like a chess match. We got a pretty good relationship. We don't engage in a lot of trash talk. We help each other throughout the year."
Clinton and Derrick both called offensive plays as Ceres High built a big lead in the opening half and thwarted Central Valley's comeback attempt with a 41-20 victory on Nov. 6.
"It's the last game of the year," Clinton said. "You always want to end your season on a high note."
Bulldog quarterback David Nichols completed 7 of 9 passes for 221 yards with four touchdowns and no interceptions.
Jose DeLeon caught two passes for 95 yards and one TD.
Brian Becerra and Jorge Tiscareno had touchdown receptions of 60 and 39 yards, respectively.
Andrew Gibson totaled 24 yards and one score on two catches.
Gibson also rushed for 90 yards and one TD on 10 carries.
Becerra gained 20 yards and scored once on four attempts.
Ceres High seized the momentum by outscoring Central Valley 28-6 in the opening half.
The Hawks scored a pair of touchdowns on their way to cutting the deficit to 28-20 with 2:34 to play in the third quarter.
"I was happy with the way our guys responded in the fourth quarter," Clinton Goblirsch said. "We try to treat them like any other opponent. I don't think the kids need that extra motivation. Give credit to Central Valley for battling back."
Ahead by just eight points, the Bulldogs accounted for the game's final two touchdowns.
Nichols increased Ceres High's lead to 34-20 early in the fourth quarter when he found a wide-open Becerra. The Bulldogs' fleet-footed all-purpose player hauled in a 60-yard TD pass from Nichols with 8:45 remaining in the game.
"We liked the matchup with Brian's speed," Clinton said. "It really gave us the momentum back."
Ceres High compiled a 5-4-1 overall record and finished in third place in the Western Athletic Conference.
Central Valley finished 1-9 on the year and in last place in the WAC standings (0-6).
The Bulldogs won their final three games, including their WAC-season finale versus the crosstown Hawks.
"Obviously, it's a great way to end the season," Clinton said. "I'm proud of the way the kids played throughout the year."
Ceres High opened the 2015 campaign with back-to-back losses.
The Bulldogs compiled a 5-2-1 record during the final eight weeks of the season.
"Our goal at the JV level is to prepare them for the varsity level," Clinton said. "Winning is part of that, too. We had a good run. We made some adjustments and were able to finish strong."