Dreams involving food, family, and unusual scenarios can be rich in symbolism. Here’s an interpretation of your dream:

1. Gingerbread Cookie: Being a gingerbread cookie might symbolize feelings of being sweet or pleasing, but also possibly feeling fragile or easily broken. It can indicate a desire to be seen as lovable or cherished.
2. Mom as the King: Your mother taking on the role of a king could suggest authority or a powerful figure in your life. It may reflect feelings of her being in control or making decisions that affect you deeply.
3. Getting Rid of Your Legs: This could symbolize a feeling of being restricted or losing your independence. Legs represent movement and the ability to navigate through life, so this may reflect feelings of being held back or not being able to pursue your own path.
4. Sisters Watching and Eating Popcorn: Your sisters’ passive involvement while consuming popcorn could imply feelings of judgment or detachment. They might represent your thoughts or feelings about how your family perceives you or how you feel about their reactions to your struggles.

Overall, this dream may signal feelings of vulnerability within familial dynamics, especially regarding independence and how you perceive your role in the family. It might be beneficial to reflect on these relationships and communicate your feelings with your family members.