[wideminded]

There were only three total children in the dungeon. The story describes them all being brought to the hospital by Fritzl.

[fetal heart beats by 21st day]

“April 26: Fritzl and Elisabeth appear at the clinic, along with two children — Kerstin’s siblings who, like Kerstin, were born and raised in the secret dungeon.”

“with two children:

I see nothing about “all.”

[fetal heart beats by 21st day]

I see what you’re saying. Sorry. Kerstin was the third child.