Hello friend, depression is very common in more developed countries.
My friend is a psychologist in Australia. Here are her comments:
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Does he have any community groups to attend to (e.g., church)?
Social interactions help to reduce depression as it provides some emotional support.
Spiritually, you should try to talk more with him more, comfort him and take up more social/personal responsibilities for his work.
Tell me more symptoms (e.g., ongoing television watching, sleeping a lot, loss of interests in routine activities, etc), then proceed.
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Spiritually, I suggest praying for him. I know it really helps! Angela

Here is an important question to ask your daddy:

"What is bothering you in your mind? You know that I really care about you so I want you to tell me your problem"

Please do that and listen first to his feelings.

Tell me how it goes.

Oh boy. Cheer up

This post has been edited by Angela Lee: May 5 2011, 01:52 AM

Your first and second points are inaccurate and misleading.
Family members provide very high quality emotional support for the depressed sufferer.
And they certainly want to feel to support and care coming from the family.
Communication is vital is this context.
"Just leave your dad alone" is not only irresponsible and may lead to undetected problems.

Also one important thing to check: "How long has this been going on for?"

Because the longer the depression, there is a higher susceptibility to morbidity or even psychosocial disability.

The longer you dad is unable to get back to regular life, the harder it is to recover (e.g., losing the skills or motivation to perform daily functions).

Make sure you check and monitor it okay?

Better explain the term binary disintegration.

What effective treatment is available for this "binary" thingy?
Where to get help for this?