3 years in a depression

I can't watch that show anymore, it just makes me wonder why someone would want to live like that. I realize that it is a mental disorder, and I don't personally understand it, but it still makes me wonder. Having said that, I have an uncle who is probably in that state, he has not allowed anyone in the family to enter his house in over 30 years. Barely even has any contact.
That reminds me I gotta go visit my uncle... I seen him the day before mother's day at the spring classic car show and he was with my cousin.. I haven't been over in about four years as he's always telling me what I can't do and i'm a can do person as you probably know... My aunt was a cleaning lady and they divorced many years ago and I don't think hes cleand since I've known him...