Very interesting. I wonder how he's tracking you and your plans. So strange.
I can't imagine how frustrated you are! Why are his late bills your problem? You're subjecting yourself to more financial liability? And he's already done the math, minus a medical bill? And he's using a court appearance threat? I guess this answers an earlier question--he was not sincere when he made pleasantries in the previous e-mail.
Good thinking about getting some legal advice. I guess it's time for that. Unfortunately, it seems like he's focusing on all the wrong things (things for himself) instead of thinking about a solution.
I'm glad to hear that your brother's tumor was benign. That's a relief to all your family, I'm sure. As for your father, I'm sorry.
Try your best to enjoy your weekend. I'll be thinking of you. Keep ignoring those e-mails for now!