Hawaiian “Mother & Child” done by Artist “Stickney”

I am looking for any information I can get on the artist who did this picture.  I was told this was a Hawaiian “Mother & Child” done by “Stickney” I believe it says.  I love the work and would like to know if there is more out there, if the artist is still alive, and if so could I contact him or her.  My cousin got this picture along with another “Mother & Child” done in charcoal, and a smaller “Lady in a Hawaiian dress with long straight hair and a large straw hat.  My cousin, Joyce Walzack, was an interior decorator and lived in Hawaii for many years before her death. I believe she got them in the ’50’s or early ’60’s. I appreciate any help I can get.  Sincerely, Mickey D