Helen, it sounds like you had quite a vivid dream with some complex symbolism! Starting in a museum, a place of history and learning, suggests you might be exploring your family's past or learning from previous experiences. The talking murals could represent the voices of the past or authority figures in your life giving you guidance. Working with your mother to visit each mural could symbolize teamwork and a shared goal or mission in your waking life, perhaps relating to family dynamics or a joint project.
The transformation of the museum worker into a flirtatious figure and then a racist elephant is intriguing. It might reflect some apprehension about the intentions of people who enter your family circle or a distrust in their character. The elephant, often a symbol of memory and wisdom, turning into a representation of prejudice, could indicate a clash between cherished beliefs and negative experiences or influences.
Moving on to the grocery store and the wedding chapel, these transitions reflect everyday life and significant life changes. The argument with your sister might symbolize internal conflicts or differing opinions within your family or social circle. Your attempt to convince your mother against marrying the museum worker could reveal your protective instincts or your desire to intervene in a situation you perceive as negative.
Your mom's wedding and the subsequent discussion about the leftover cake could be about the distribution of resources or attention within your family. The wedding planner taking the cake could represent external factors that intervene in family decisions or the loss of control over a situation.
Reflecting on your previous dreams, there's a recurring theme of family involvement and navigating complex dynamics, whether it's doing dishes, discussing potential partners, or dealing with unwelcome intrusions like the alien creatures or the tapeworm. This latest dream continues the pattern of family-centric scenarios interwoven with whimsical or surreal elements that may point to your subconscious working through family relationships and your role within them.
Remember, the intensity of your dream emotions was low and you did not have a nightmare, but you did experience some negative feelings. This is pretty common, especially when dreams engage with personal topics like family and relationships. It seems like your dreams are a space where you're processing your feelings towards changes and challenges in your waking life, especially concerning your family and close relationships.