A resident of Bashkiria was surprised to learn that an unknown sister had turned up: a 74-year-old woman from the Chelyabinsk region said that her mother had a relationship with his dad. Did the head of the family have six legitimate children and a seventh illegitimate daughter?

The man became the father of two daughters from his lawful wife and two daughters from his mistress. At the same time, he did not raise any daughters from his wife, but supported the daughters of his mistress in everything. After the father of many children signed the contract and left for his own, his wife, mistress and daughters decided to find out who the payments were due to. So how many biological daughters does a man have?