I think it's quite sad. I'm the same age as the father, and I can't imagine what it would feel like to find out you were having a child when you're still a child yourself. The media and other sources seem to make out that sex is such a cool thing that everyone should be doing from a very young age. Clearly there needs to be better education on contraception and sex, because unfortunately teenage pregnancies are becoming less uncommon in the UK - our rates are the highest in Western Europe and double those in France and Germany.
Good luck to them though, as what's happened has happened, and the families seem to be very supportive.