The root of the question I've asked myself about why many of the Disney main characters only had one parent or neither was discovered that it could be related to Walt Disney's own life. Walt Disney bought a house for his parents to live in out of generosity but things didn't end happily ever after. Walt's parents died due to something wrong in the house such as leaking gas, and Walt forever blamed himself for it. This may be why so many of the parents are not in the story line or die near the beginning. Such as: the mothers of Nemo, arial, sleeping beauty, bambi, pocahontas, lilo, etc. And father of simba, also both parents of frozen characters, and tarzan. Coincidence? I think not.