Caitlin's father suffered from multiple sclerosis and despite fighting it for years with his wife, Dr. Carla Tannhauser, trying to cure him. Eventually, he died, much to heartache of his wife and daughter. As Carla tried to cope with the tragedy by burying herself in the work, she and Caitlin became estranged from one another.
Mr. Snow was a very loving and caring father. He was also a very loving husband as Carla Tannhauser couldn't handle the pain when he died.
- "The Reverse-Flash Returns" (mentioned)