No its not healthy. Sleep is very important the body needs at adverage 8 hours a night for fully grown adult and 10 for us children failure to do so could result in numerous physical and mental anguish (i wont go into details). and if hes been doing this for 10 years its gonna start taking its toll on his body physically and mentally.

He needs to find a new way to support you guys im sorry but this is not good. You could ask your dad how he is feeling just to get the gist of it; also you could try and help out in the house more and give him less work to do if he does any at home. Lastly you could just try to make him comfortable.

__________________
The Seven Deadly Sins:
Lust,Gluttony, Greed, Sloath, Wrath, Envy, Pride.
We're guilty of them all. O well looks like we're all going to hell! (=you)