What will be the new relation that would be established ?

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Once a king had a war with some other king.
He lost and his wife and daughter went to the forest for shelter.
They were sleeping when a king and son were passing by.
They were stunned by their beauty.
They wanted to marry them but were confused
about who was the mother and who was the daughter
So they decided to follow their foot steps.
The foot steps that the prince followed lead to the queen and the king's lead to the princess.
Both agreed to marry the king and princess.
So tell what will be the new relation that would be established?