"The family link between OS/2 and Windows NT" https://liam-on-linux.livejournal.com/54138.html
"Follow-up: the family links between DOS, OS/2, NT and VMS" https://liam-on-linux.livejournal.com/54464.html
There's a citation in that 2nd blog post. Well, there are lots, but the IT Pro Mag one goes into detail about the OS/2 and VMS connection.
Enjoy.