A: If your parents are on cordial terms, then you shouldn't have a problem taking photos with both of them at the same time.
If your parents are not on good terms, you may need to talk to them before your wedding day and ask them to be civil to each other just long enough to get through formal portraits. If you think asking them to be in the same photo with you will start World War III, then you may want to consider skipping that photo.
If one or both of them has remarried, you'll need to include him or her in a large family photo, but you can still take a photo of just you and mom and you and dad.
Only you know how to manage your specific family situation, but try to talk to each of them ahead of time and ask a sibling, cousin or other relative or friend to intervene if the situation escalates. You don't need any added stress on your wedding day.