[Me and my cousin at Christmastime. At Grandma and Grandpa's (or maybe Great-grandma Chella's) house.]
Maybe from later that same visit:
Cousins Dinah and Jeanette with Great-Grandma Chella. 24 Dec 1967.
Larry says, "Looks like the back yard at 656 Poplar Ave. in Wasco."
Slides developed June 1967. Photos by Bob or Susie McCombs.
Slide developed May 1967. Photo by Bob McCombs.
Maybe from around the same time?
Photos by Bob or Susie McCombs