if you want comfort read the other comments, and if you want change, read this one. people here seem to think "homeless mess and sad liability dad," is better than "far away dad who will come back," which I think is insane.
depression is a terrible disease because it's like an addiction that gnaws at your humanity and makes you a slave to it, and a lot of parents use their kids as enablers and a source of supply. if change were easy, everyone would do it.
laptops are generally more expensive than an old PC, children aren't assets to be used as connections or leverage to get himself out of this situation, they are people he has a responsibility to that he has failed to be able to meet.
nobody has to follow this, but they have to face the possibility and then decide whether it reflects the truth.