@muaaz: hmm.. that is tru...according to islamic point of view the son an ddaughter - ali and amna - are ghayr mehrams for each other... no blood relationship...
per u know wierd yeh hoga iff their parents have another kid... that wud be really wierd becuz then, the kid will be REAL half-sibling of both of them.. :S
i think, in the first place, wht the parents did by amrrying each other at this age was wrong.. because the mother has two ADULT daughters... do jawaan larkiyaan..the father has one jawaan son...if they marry and then force every1 to live together, do they NOT know of wht can happen if u make ghayr mehrams live together? wudnt there always be a possibility of the son falling in love later on with one of the gals??
if the mother wanted to marry so much, she shud have first waited for the daughters to get married... :S aise jawaan betiyon ko utha ke kisi aur ke ghar laaya jaata hai kya? that is so wrong...