BRAIN TEASER ::: Mary’s husband’s father-in-law is Mary’s husband’s …………….How did this happen ?????

BRAIN TEASER ::: Mary's husband's father-in-law is Mary's husband's ................How did this happen ?????

Mary’s husband’s father-in-law is Mary’s husband’s brother’s brother-in-law, and Mary’s sister-in-law is Mary’s brother’s stepmother. How did this happen?

Mary’s sister in law married Mary’s father. her husbands brother married her father’s sister.

i

Mary’s father married the sister of Mary’s husband

Tricky! Well,no idea