Update: Additional comments from Jeremy Manier were added to the third-from-last paragraph.After a wealthy family sued the University of Chicago in February to back out from a $100 million gift, the school swung back last week seeking to dismiss the suit and collect on a missed $13 million installment.The Thomas L. Pearson and The Pearson Family Members Foundation alleged in Tulsa, Okla., federal court in late February that the school violated the terms of a grant agreement. The Pearson Foundation is seeking recovery of …