The Fatal Wedding

The Fatal Wedding is a 1911 Australian silent film directed by Raymond Longford based on a popular American stage melodrama which he and Lottie Lyell had toured around Australia.

An adventuress, Cora Williams is in love with Harold Wilson, even though he is happily married to Mabel, and they have small children. Cora gets a man called Curtis to pretend to be in love with Mabel and engineers a situation where Harold walks in on them and gets the wrong impression. It works, Harold divorces Mabel and gets custody of their children Jessie and Frankie. Mabel winds up abducting them.Five years later Cora discovers Mabel living in poverty with the children. She tries to poison Mabel and frame Jessie on a charge of theft but is unsuccessful. Howard and Mabel eventually reconcile and live with their children. ........

Source: Wikipedia