LeBron's sons -- 6-year-old Bryce and 9-year-old Bronny -- teamed for a crazy alley-oop style slam on Christmas morning ... and LeBron was so proud, he posted the footage online.
James even Instagram'd a message to L.A. Clippers stars Blake Griffin and Chris Paul ... saying, "Bronny and Bryce gone hold down Lob City until y'all get back. Cool? It's like the both of y'all but we gone keep it in our room. Haha."
Fun Fact -- If LeBron can stay healthy to play in the league for 10 more years, he's got a shot at playing ALONGSIDE his son.
No pressure though, kid.
