The outgoing message on the McStay's home answering machine is a chipper one, wishing callers to "have a nice day!"
"I just want my brother and my nephews and my sister-in-law back," said Michael McStay. "Those boys are adorable. We just want them all back."
Michael McStay said that he and his older brother, who is called Joey by those close to him, were best friends growing up in Texas.
"My brother is awesome," he said. "He is such a compassionate, caring person and so giving. He's likable and honest. That's why so many people are rattled by this."
Asked whether he could think of anyone who may have wanted to hurt his brother, Michael McStay said he coudln't think of anyone who didn't like his brother.
Speaking on behalf of his mother and father, who he said are both "a wreck," Michael said that while he's praying for the family's safe return, he's not naive.
"With what's going on in today's economy and how close his car was found to the border, the first thing I'm thinking is that it has something to do with money," said Michael McStay.
"People do stupid stuff for money, but I'm praying for the best."