Oh, I know it hurts but we were not meant to keep them with us forever. They have a life to lead, Seth has taken his first steps into that life. Hugs to you, Tracy and his brother. Do keep us up to date on his adventure.
Scott, I know exactly how you felt-- when my daughter went away to college I blubbered like a baby. You'll miss him, for sure, but it will be fun following his progress and taking pride in his accomplishments. Seth's started on a great adventure... keep us posted on how it goes so we can share the journey too.