Stranger added to family group chat restores 'faith in humanity'

Like any good great-grandmother, when Beverly Garrett was awaiting news on the birth of her great-granddaughter, she reached out to all the phone numbers she had for her grandson -- even a number that no longer belonged to him.

As Zach Garrett waited for his wife Sierra to deliver their daughter, Layla, he responded with updates to his grandma's group text. What came next gave Garrett "faith in humanity," he told "Good Morning America."

"My grandmother was trying to get a hold of me for updates, and she accidentally added my old cell phone number and my current number," he said. "When we first heard from him I was a little embarrassed that me and my grandmother were talking away with him stuck in our group chat, but his selfie brought so much humor to the situation. We all had a good laugh! Bobby could have been really rude or told us to take him out of our chat but he didn’t. He was so nice about it."

Bobby is Bobby Watson from Malvern, Arkansas.

"I was actually added to the group weeks before responding," Watson told "GMA."

As it turns out, Watson has a family member named Zach and was embarrassed thinking he had missed an important piece of family news regarding a baby on the way.

But when Garrett sent the photo of Sierra and the baby, he realized he didn't know them.

"I couldn't resist inserting myself," Watson said. "I felt it would make them laugh while already being in a joyful mood." Watson donated $50 to Garrett's cash app for diapers.

Since Garrett posted the story and screen shots to Facebook, they've received almost 50,000 shares. The $50 for diapers has become more than $700 with donations from strangers touched by Bobby's gesture.

Watson told "GMA," "I think people like the story so much because it was a real interaction between strangers that shows no matter race or gender people can be good to one another. In a time where it seems a social divide is being pushed ... there's good people everywhere you go."