He's also talking to his sister and father each week, often for as long as an hour at a time.
It's like "old buddies, old friends" chatting, Robert Hutton said of conversations with his sister.
Their aging father, now 87, and new step-mother have already driven twice to see Robert Hutton in Montana.
"It was great," Robert Hutton said of his father's first visit in July, adding, "I told him, 'Well, now I know why I'm so ugly.'" They shared a laugh over that.
In a thank-you letter to Moran after the visit, Robert Hutton's father called the reunion "very emotional for both of us."
Sister and brother, however, haven't been able to visit each other yet, hindered by financial limitations on both sides and the long hours Robert Hutton puts in at the factory.
"We will see each other as soon as we can. We know that," said Edyth Hutton, now living in Lake Tahoe, Nev.
The reunion will be thanks to the work of detective Moran, who went "the extra mile to bring something good out of a tragedy like [the] John Wayne Gacy episode," said Robert Hutton.
In fact, since Moran's office reopened the case in 2011 – 17 years after Gacy was executed – four other missing men have been found alive and reunited with their families. One of the unknown Gacy victims has also been identified.
And this Christmas, for the first time in four decades, the Hutton family will be able to share the holiday together – even if miles apart.
"I already got the cookies figured out that I'm going to bake and send them," Robert Hutton said.