Kim Zolciak and estranged husband Kroy Biermannput their family drama aside to support their son Kash at his high school football game … as their 15-year-old son Kroy Jr. remains jailed without bond.

The “Real Housewives of Atlanta” alum was spotted at the game in Alpharetta, Georgia … arriving with daughter Kaia and rocking an all-black athletic look with white sneakers.

The former NFL linebacker was photographed leaving roughly 30 minutes after Kim arrived … and before the game had ended.

The family outing comes during an especially turbulent stretch for Kim and Kroy.

As TMZ reported … Kroy Jr. remains behind bars after his August 17 arrest on aggravated sodomy and aggravated sexual battery charges stemming from allegations made by a female classmate.

Kim has vehemently deniedthe allegations against her son … and recently refused to answer questions about his case while traveling through a Florida airport.