Except answer from the wise people

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Now I am going to tell a story I had read. A king was defeated by another king. He has lost all his wealth and kingdom.The king escaped and reached a forest, with his wife and only daughter. Unfortunately the king passed away. The queen and princess became helpless.After a few days another king, near to the forest and his son came to the forest for hunting. In their journey through the forest they could see foot prints of two women. They had taken a decision.The king will marry woman with big foot print and the son will marry the latter woman. Finally they discovered the two women following foot prints.The queen was with small foot print and the princess with big foot print.As decided earlier the king married the princess and his son married the queen. After ten months the queen and princess had given birth to a baby each . My question is here; what will call the the two children each other when they grew upto recognise each other.