['I am sad but ready for my child to graduate high school.', 'Aw.  I bet that is so bittersweet. Do they graduate next May?', 'Yes and he already knows where he is going to college.']
That is a good sign!  I know many kids that age who have no direction so it sounds like he's really going places.  Do you have any other kids that will still be at home?
I am sad but ready for my child to gradate high school.