If taking care of the frist two kids was a full-time job for one of the parents, a third kid should have been out of the question regardless of the genetics lottery. But people in love do horribly stupid things.
As much as I feel bad for the kids, my there's too many out there for me to take any financial interest in them. Besides, I think half of them are scammers. I know a childhood friend who had a sick kid - needed a transplant or something. The guy had a very high management job at his dad's company (essentially 25yrs of promotions given to him), his wife had a good job, and all grandparents were rich - one set paid for their 3k sqft house. Essentially they could afford the best healthcare. Yet...he set up these donation buckets all throughout the area. Turns out he banked 2x what his medical costs were and the kid got better.
The best part? The buckets were left out for nearly a year after, collecting money to help him buy his new CORVETTE. Or at least it paid for the Z06 option he added.