Wife below and one son (Raymond) are also buried in the same cemetery.
WA State Digital Archives states he married an Olive Aversing June 23, 1914.
His mother was Anna (Shea) McInnis.He was born in Canada as were his parents. Her parents were Henry and Agnes (Shultz) Aversing both born in Germany.Olive was born in IA.
1920 Census: Chambers, Thurston, Washington
Frank Mcinnes 34  Olive E Mcinnes 24 Agnes Mcinnes 5 Carl Mcinnes 3 [3 6/12] Raymond Mcinnes 1 - Middle name may be George [1 6/12]
This could be Carl's death information and seeing the location of death, he may be buried in the same cemetery as his parents and Raymond.
Birth Date: 03/29/1916 Death Location: OLYMPIA, WA Name: CARL H MCINNIS Death Date: 11/13/2001His obit is posted in The Olympian; 2001-11-15.You could try Ask A Librarian for an obit free of charge but it can take 4+ weeks to get it.
Would there be any reason why Frank and Olive would change their name to Hildebrand?1940 Census has a Frank, Olive, Carl and Raymond living in the same city and county as above.And there is a 8 year old grandson named Van Welker.
Hope this helps you in some way or others to help more.Take care.