We have an exercise on parallelism involving rewriting sentences correctly; there's this one sentence I'm unsure as how to rewrite.
Mother cannot decide whether she will allow Cecil to attend the party or not because of the bad weather condition.
Would the following be a proper correction?
Mother cannot decide whether or not to allow Cecil to attend the party because of the bad weather condition.
I honestly can't find faulty parallelism in the original sentence, so an explanation will be very much appreciated!