All Mine to Give (1957)

In this fact-based drama set in the 1850s, the Eunsons move from Scotland to the American Midwest, where they live happily and run a successful business -- until the untimely deaths of both the father (Cameron Mitchell) and the mother (Glynis Johns) of the family. Now orphaned, the six Eunson kids must fend for themselves. Robbie (Rex Thompson), the oldest, does his best to care for his siblings while he searches for foster parents kind enough to accept such a large family into their home.