In the 1930 Census, the latest we are allowed to look at for privacy reaons, Carl and Anna were listed under Wistrom, Hilding C., as if Hilding was Carl's first name. They had two daughters at that time, Betty Ann who was 4 and Helen J. who was 8 months old.

Since they are both girls, no way to tell who they married so no way to tell if any offspring/still living, etc.