Featured Pencil Drawing Old man and granddaughter Portraits help ID sign Sarah?

The size is 18 x 24 approximately.
At first, It looked like it was printed with white ink then black on a yellowish paper. That does not sound right so maybe the yellow is acid? Any and all help would be greatly appreciated. Seem like I seen this image somewhere before.

 

I wondered if it might be Sandu Liberman as the subject matter is similar but couldn't find a signature that looked like yours. They all seemed easier to read.

 

Can't rule out it's a little boy, even the old man himself as a small child.

 

Thanks, SIS, I will search that angle Bronwen,

 

well, it will need a good cleaning. I wonder if the artist made any changes after the proof was run.

 

p/p.. is a printers proof.....there should be no changes made to the rest of the edition..

 

Thanks, Komokwa