By this time, a couple of the girls were married with kids of their own. I suspect it was one of Helen's trips home from Los Angeles, always an occasion for a happy sibs get-together.
I can probably name five or six here, but there'd be a lotta guessing going on ☺
Here's Adeline and Bob, with Joanie, Karen and Renee, the baby. Renee was born in 1949 and Bob died in August of 1951 so this has to be summer, 1950.
Thanks for the pictures, Laura!