In a heartfelt Instagram post, American singer and rapper Becky G on Thursday introduced fans to her brother Alex, one of an estimated 2 million individuals in the United States affected by autism spectrum disorder, or ASD.

"You guys don't see much of him because he's not as present on social media," Becky G noted. "(But) I just needed to take a second to say that Alex is one of the best things that's happened to our family," the 18-year-old added.

Her brother has taught her values such as patience and honesty, the "Shower" star said.

"He's loving and so smart," Becky G, whose full name is Rebbeca Marie Gomez, wrote. "I'm so thankful to have him in my life," she added.

About 1 in 68 children born in the United States are identified with autism spectrum disorder, according to data from the Autism and Developmental Disabilities Monitoring Network of the federal Centers for Disease Control and Prevention. Autism and ASD are defined as a group of complex disorders of brain development that can lead to difficulties in social interaction and communication, as well as repetitive behaviors.

The disorder, which is five times much more common in boys than in girls, can be extraordinarily challenging for parents and families, Autism Speaks explains; there is no medical detection or cure for autism, and apart from the emotional toll, treatment can costs some $60,000 a year, the U.S. advocacy organization noted.

Becky G admitted that in her family's case, too, things have not always been smooth sailing.

"Growing up with a brother who has autism wasn't the easiest," she noted. "My love goes out to all the kids with autism and families that have special one of a kind little gems like these kids," the singer added.

One of the things she admires most about her brother, meanwhile, is his honesty, Becky G revealed.

"He tells you exactly what's on his mind and tells you how it is," she said. "I'm so thankful to have him in my life."