it find the persons knowledge to find the blood relations
here some ethics
M=MOTHER F=FATHER
m and f' son = brother
m and f's daughter = sister
m and f brother = uncle
m and f sister = aunt
m and f father = grand father
m and f mother = grand mother
son's wife = daughter in law
daughter's husband =son in law
H = husband w =wife
h and w brothers = brother in law
brothers son = nephew
brother's daughter= niece
sister husband = brotherb in law
brothers wife = sister in law
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