Both William T. Deutschendorf and Henry J. Deutschendorf II are the baby actors that together played Oscar in Ghostbusters II. That however is the only acting gig the kids were in.
Today the brothers are Martial Art Instructors for West Coast Martial Arts Academy, and they go by the names Will and Hank. 
- ↑ http://www.facebook.com/KBouseki
- ↑ Information from Paul Rudoff at Spook Central Web Site