My Boy's Coming Back Home

Just got off the phone with the Ex. She and Colter have been in Minneapolis since Wednesday. They've hit the half-way point on their way home (Bismarck, ND), and Colter called to say good night. I told Colter to give me a call when they got home tomorrow. Colter's always been more of a Momma's boy, and I didn't expect him to say yes, but this surprised me, and I could hear Ex laughing loudly in the background:

"Give me a call when you get home tomorrow, ok, bud?"
"Ok, Dad."
"You know, you could stay with me tomorrow night if you wanted." ( I could hear him smiling)
"Ok, I'm sick of Mom having me."