Tuesday, Dec. 22—Ben and Tari Errthum of Rochester, Minn., a son, Quinton Benjamin Errthum, 7 pounds 4 ounces, 19.5 inches long, born at 5:11 p.m. at Methodist Hospital in Rochester. He joins a sister, Vanessa 2 1/2. Grandparents are Charley and Judy Errthum of Glen Haven, and Linda Lange and the late Rick Lange of Houston, Minn. Great-grandpa is Bernie Thompson of Platteville.