Civil

children of B will get share but B will not get any share in the porperty of x

It will be divided into 6 shares. One for the legal wife and the remainder to the 5 children.

equal shares to each heirs.

under Hindu succession act all legal heirs have equal share in property...

which religion ?.. if they are hindu... A and 5 children get equial share... if x and A marriage not disolved, B has no right over the property of x