I'm not sure his wife would take too kindly to the suggestions that she spend all day on her own in a not-finished house, with two young children, no car, no oven, with only RTE1/Network 2 for company for 6 months. How will she get out to get milk if it rains?
She may not Phileas, but she wouldn't be the last and she certainly isn't the first person who has had to sacrifice something now to gain something more later. Nor would she be the first person to use an umbrella while pushing a pushchair or have to mind a child in a semi-finished house. Needs must so you do what you have to. However, who ever said you HAVE to spend €15k on purchasing a car?
I agree with you though, I think they can afford their mortgage and they can afford to do up the house, just not the way they have gone about it. From what I have read, they seem to be chronically indebted, not unaffordably so, but foolishly and unnecessarily so. And they seem to view more debt as the best way forward. The root cause of today's distress is an ability to spend tomorrow's money on today's luxuries.