This is Richard and Kristin Blomberg with their sons Joel (oldest) and David.
The son David visited Sweden around 1970 with his wife Alice. Annika Davidsson met them in the home of two of Davids cousins, namely Milda and Nelly. They were the two daughters of Richard sister Jenny Wiberg (b. Blomberg).
Owner/-s: Birgit Blomqvist, Sweden
Comments: Thank You, Annika, for identifying them!