Everyone in my family can do the splits but me
Dreams about physical abilities often reflect feelings of self-perception and comparison with others. In your dream, the act of everyone in your family being able to do the splits while you cannot may symbolize feelings of inadequacy or a desire to fit in. This could indicate that you feel like you're falling short in some aspect of your life, whether it's your physical abilities, emotional flexibility, or dealing with family dynamics.
The splits themselves can also symbolize balance and flexibility in navigating life's challenges. Your inability to perform them might suggest feelings of rigidity or an inability to adapt in certain situations, particularly within your family or in relationships.
Consider reflecting on your current relationships with your family and any areas in your life where you feel pressure to meet certain standards or expectations. This dream might be prompting you to examine those feelings and determine how they affect your self-esteem and personal growth.