Supermodel Stephanie Seymour is back to her old habit of calling the cops when she’s got problems with Peter Brant — but this time it’s about her son Peter Jr., not her paper magnate husband, Peter Sr. On July 4, Greenwich, Conn., police said, Seymour called them after having a dispute with 18-year-old Peter Jr., which Peter Sr. witnessed. Lt. Richard Cochran said that when police responded, they were told the mother and son had argued because “the son was going to visit with the mom, and the mom canceled.” Cochran said: “It was all civil in nature.” Seymour’s lawyer, Mark Sherman, said, “No comment,” when asked about his client and her family. A spokeswoman for Brant declined to comment about the incident.