Maine ye socha tha uss din...
This is Parent Trap ka story...
There , they are twins separated at birth unaware of each other's existence, meet at summer camp, realise they are siblings and in the end of camp switch places. Their parents realise it when they see difference in the behavior. About dresses, food choices, language etc.
Eventually finding out and parents patchup.
But is 'complex marriage' ka kya karogi 🤪