A source tells People, "They have a great relationship. Garry has always been there for Barry."
Manilow has always been reluctant to discuss his personal life. In 2012, he called himself a "private guy" in an interview with The Telegraph.
"You can only come into my world if I invite you in. From the very beginning that was the rule. I learnt how to deal with the publicity/press thing," he said at the time. "You just say, 'I'm not interested in talking about [that].' Even the names of my dogs! They are my kids, my friends are my friends and my family, they are mine. That's the only way I can survive. I have to keep that to me. I don't want strangers knowing everything. If that happened, that would drive me crazy."