When I heard the name I thought this was the former Admiral John Poindexter who was a national security hoo-ha once upon a time
different John Poindexter?
Checking the contra Poindexter's wiki page, it notes he had five children, including the late Alan G. Poindexter, a NASA astronaut. None of the other children are identified...(perhaps Vietnam vet, John Poindexter is one of his sons/nephew? - speculation)
A link to the obit for Alan doesn't make any reference to his father's identity
Neither does Alan's wiki page.
Perhaps contra John Poindexter's family details are not online because of the sensitive nature of his work.
Ranch owner/Vietnam vet, John Poindexter does mention a long established military history for his extended family.
Yes, different guy.