What is that movie with the scarecrow?

Okay so there is a movie that has a mother and her son(i think) and they have a scarecrow in the field and at night it comes alive and protects them by killing people messing with them. But in the end the viewers find out that the scarecrow is actually the dad but he has a mangled face so he hangs by day. Also I think it is an older movie. Thanks!