ANCHORAGE, Alaska (AP) - The 18-year-old daughter of former Republican vice presidential candidate Sarah Palin has given birth in Alaska to a son. People magazine reports that Bristol Palin gave birth to Tripp Easton Mitchell Johnston on Sunday. He weighed 7 pounds, 4 ounces. Relative Colleen Jones tells the magazine the baby is fine and Bristol is "doing well." Jones is the sister of Bristol's grandmother. The father is Levi Johnston, a former hockey player at Alaska's Wasilla High School. He has said he and Bristol plan to marry. Palin created a stir in September by announcing the pregnancy as she prepared to accept her nomination at the Republican National Convention. The governor's office called the birth a private family matter.