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John Kimball grew up the middle child of Ward and Betty Kimball ...
He had a younger and an older sister (Chloe and Kelly). Of Kelly (the first-born) he says:
"She let me know that I was going to be behind her in artistic pursuits. 'I started two-and-a-half years ahead of you, John, and I'm going to stay two-and-a-half years ahead of you.'"
(Kelly is an accomplished costume designer, working principally in live-action.)
Both Kelly and John attended Chouinard Art Institute. Kelly went into costume design early on, but John followed his father's path to Disney's. He talks about those things and more here in the second installment of the TAG interview.