Parents: Betty, Robert Crawford Click to see full answer. Just so, does Johnny Crawford have a brother? Robert L. Crawford Jr. Subsequently, question is, who is Johnny Crawford married to? Charlotte Crawford m. 1995 Herein, does Johnny Crawford have Alzheimer? Johnny Crawford’s Alzheimer’s The Rifleman star isn’t in a good state as he is struggling with Alzheimer’s disease. Johnny Crawford (born March 26, 1946) became a household name for his role as Mark McCain in ABC Western series, The Rifleman.How old is Crawford Jr? 75 years (May 13, 1944)