When Mr. Simms found out about it, he found out where he was and burst in on them and dragged his disobedient son out in his underclothing stating that he was too young for marriage. When Mr. and Mrs. Oleson found out about the marriage, they forced Nellie out of the marriage as well for the same reasons as Luke. (Episode 412: Here Comes the Brides)
Luke and his family would later leave Walnut Grove when the town faced difficult economic times.
Behind the scenes
Luke Simms was played by Bob Marsic.