There are other unbelievable parts of the story:

• He brought 3 of the children “upstairs”, he told he found them on their doorstep. 1 child died after birth, 3 spent their whole life in the cellar, the oldest was 19 years old when saw the sky first time in her life.
• His wife living upstairs with the “found” children didn’t know anything about what’s going on in their cellar.
• It happened in Amstetten, Lower Austria, a town with 20000 people