I’ll spend a few minutes here researching it and get back on the thread here.
FWIW Wiki says under the heading Family Life, "The Palins have five children. Their son Track, the oldest, is in the United States Army and scheduled for deployment to Iraq on September 11, 2008. They have three daughters, Bristol, Willow, Piper, and a second son, Trig, who has Down syndrome and was born one month prematurely. Palin fishes and is a pilot holding an Airplane Single Engine Land license."