relationship puzzle

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this time its not a discussion though but would definitely looking for some logical answers.and i think my lot is a better place to get that.so here it goes... 1.there was a king with a very beautiful daughter and wife.one night they had to leave the palace cause the ministers wanted to kill them all. 2.while passing through the jungle robbers attacked them and took all the valeables by killing the king... 3.the queen with her daughter escaped though but didn't find any otherway than crying nearby a river... 4.nearby states king and his son was on hunting that night when they heard the crying... 5there were two sizes of foot prints that they were following one was smaller one and the other was of a mature person's... 5.while following the foot steps marking the young prince told his father that since he is not married and his mother is passed away so when they find these two women they will marry them.as the prince will marry the woman with smaller foot prints and king himself will marry the larger foot printed woman... 6.now they found the women and assured them of safety with welcome to their palace... 7.as per the promise between the king and the prince they decided to marry them.but here is a twist to the story.the daughter had the larger foot and the mother had the smaller ones... 8.so the prince got married to the mother and the king got married to the daughter.the daughter became the mother in law of her own mother now. 9.after one year both the women gave birth.the king had a boy and the prince had a girl child... 10.so my question is that what is the relationship between the new born baby boy and baby girl?... if you have something to say in answer then please do not hesitate to write here... happy my lotting...