Is it possible Stanley Armour Dunham really Robert Sheldon Bush uncle to GHWB?

Interesting information just found..doing a dig on Bush family possibly using a pseudonym, and wouldn't you know, found a Uncle of GHWB,(Robert Sheldon Bush) who supposedly died…but something doesn't add up here:

He was 3 yrs old, there is no grave stone. There appear to only be 3. In addition, there's a handwritten note to his "labeled plot" which plots who is buried there, his name is not mentioned.

Stanley Armour Dunham

Said DOB/Death

March 23, 1918- February 8, 1992

Is it possible this man is really uncle to GHWB?

Look at these pictures and see of any of this resonates.

https://www.randomhouse.com/doubleday/thefamily/media/thefamily_family_tree.pdf

https://www.findagrave.com/memorial/143195125/robert-sheldon-bush

'I've never missed my grandfather more': Obama leads tributes to D-Day heroes and breaks from prepared remarks with emotional tribute of his own

https://www.dailymail.co.uk/news/article-2650257/Greatest-Generation-salutes-fallen-comrades-President-Obama-US-World-War-Two-veterans-flock-beaches-Normandy-mark-70th-anniversary-D-Day-landings.html