Because Their Hearts Were Pure - or - The Secret of the Mine

Two worthy widows, whose livelihood depends on their coal mine, are subjected to a villainous banker who holds a mortgage on the mine and plans to foreclose. The daughter of one widow is engaged to the son of the other.  When faced with impending foreclosure, the girl seeks a precarious livelihood as a schoolteacher, and the young man becomes a reluctant sailor.  The banker, seeking not only to get the mine but the heroine as well, has spun a wicked web to ensnare them all.  (Rated G - family friendly)