I came across a really cool article from 2011 written about the Harbaugh family that also sheds some light on their relationship with Hoke and Mattison. I'm sure most of you already knew Hoke worked for Jack at WMU but still there are some nice stories in the article. Here is 1 of them
". Turned out Hoke's wife, Laura, was in labor -- three months early. Harbaugh rushed to University Hospital in Kalamazoo and sat in the waiting room with Brady's and Laura's mothers. "Jack Harbaugh took charge," Hoke says. "But that's just the person he is. He's tough, but he had a great personal side to him." Kelly Hoke was born that night, weighing 1 pound, 14 ounces. With Hoke stranded in Fort Wayne, Harbaugh was one of the first people to see Kelly. "You could hold her in the palm of your hand and her little hands and arms were hanging down," Harbaugh remembers. For the next 19 years, whenever Valentine's Day rolled around, Jack Harbaugh placed a call to Kelly Hoke, wishing her a Happy Birthday. Hoke never forgot it."
Plenty of other Michigan related stories in the article and worth a read if this stuff is new to you like it was for me.