* Rick Armstrong is a retired aeronautical engineer who worked for the US Navy and NASA. He is now a private citizen and does not publicly share much information about his life.
* Mark Armstrong is an entrepreneur and businessman. He co-founded a company called "Caregiving.com" and has been involved in several other businesses. He is also a licensed pilot.
Both sons are private individuals and keep a low profile. It's difficult to find much public information about them beyond basic biographical details.