You can do it with points, but you have to call up and have them issue the cert in his name. They won't earn points and won't get any of your benefits. It's against the official terms of the program to have him stay under your paid booking, but it's rarely enforced stateside. There is no official way to share your status it's meant for your personal benefit. Hyatt has something called Guest of Honor but Marriott has nothing like that.