Karl-Anthony Towns admits it was extremely emotional to have his father back in the stands at his NBA game on Monday -- the first time he's attended a game in person since the death of Karl's mom.

As we previously reported, Jackie Cruz-Towns passed from COVID-19 complications on April 13, 2020.

Jackie and her husband, Karl Towns Sr., were staples at their son's basketball games from the youth level all the way to the pros ... but Karl Sr. hadn't been to a game in person since her death.

That changed on Monday when Karl Sr. strutted into the Barclay's Center in Brooklyn to watch his son's Minnesota Timberwolves take on the Nets.

"Gonna do it for his mom tonight," Karl Sr. said on his way to his seat ... "Wolves, let's go!"

Unfortunately, Minnesota couldn't overcome that insane Nets offense and lost 112 to 107 -- but Karl Jr. played REALLY WELL, finishing with 31 points, 12 rebounds and 5 assists.

After the game, KAT opened up about what it meant to have his father back in the building.

"It was really the first time having family watch me playing in person,"  Towns said.

"He understood how upset I was after the loss ... But he came to me, and he told me something I don't know if he should've told me. It got me a little emotional. He told me my mom would've been proud with how I played tonight."

KAT said he also shared an emotional moment with his dad BEFORE tip-off.

"Me and my dad got emotional before the game. Because he made his presence known. It affected me because my mom always did that.”

“My mom would be the one to go to the stanchion or be there and wave at me until I said hi to her or came and hugged her.”