User blog comment:Isabella and Lego Liker/Run Candace Run and Last Train to Bustville on Youtube!/@comment-3006892-20110306153521/@comment-5151799-20110309205650

I thought it was something like the tension between a guy and his father-in-law. Let me elaborate:

Of course, this may have some conflictions with the timeline of the show, such as Linda already having Phineas and Candace before she met Lawrence, but meh, it's a good guess, right?