there is no fixed “mom” or “dad” figure in gaang because every member thinks the other person is the “parent”. Ask Aang, and Sokka’s the dad. Ask Sokka and Katara’s the little sister and mom and pain in the ass + Aang’s the grandpa and little brother. Ask Katara and Sokka’s the pain in the ass dad and older brother. Toph is big sister and little sister and grumpy aunt and possibly little brother They’re all taking care of each other in different ways and play different roles.