3-year-old excitedly greets brother returning from school in heartwarming video

The heartwarming moment between Ava and Tariq Johnson is getting attention.

— -- A brother and sister who used to fight constantly are now inseparable.

Jackson, a mother of three, told ABC News she pulled out her phone to capture the sibling love to show to her husband. It's because her two eldest children used to bicker a lot.

But when Tariq enrolled in kindergarten this year, the siblings' bond strengthened. In fact, on Monday when Tariq came home from school, his younger sister "flew out of the house" to greet him, their mother said.

"So I pulled out my phone to show my husband, 'Look, we're doing something right," she explained. "It was such a pure moment."