How many is too much?

There was a sad story in the UK News this week, where 5 kids died in a house fire, they were aged between 5 and 10 and a 13 year old is still critical in hospital. Here is a link to the story:

http://www.bbc.co.uk/news/uk-england-derbyshire-18044324

However, in the story, the father of the children, lives in the house with his wife AND girlfriend, and has fathered 17 (seventeen) children. So how many kids is too many? How can he support that many kids?

Update:

The 13 year old boy died in the early hours of this morning, after his parents both agreed to switch off the life support machine

That's sad especially for the 13 year old boy.

As for how many kids is too much. Well I dunno. I believe as long as you can fully support your children in terms of education, food, shelter and give them the attention they need then I think it's okay.

However living with your wife and girlfriend I think is a tad weird.