Length does not matter. Write a sentence or a whole story.
Literary skill does not matter. You don't need to try to be fancy. Simply tell us in your own words what you remember.
Content does not matter. It doesn't have to be a story. You could tell us about a custom that may not be generally known or has fallen out of practice today such as ways children showed respect to elders. Or you can tell us how your family used to do things. These can be daily things, or special things, like dia de los muertos or posadas at Christmas time or cascarones at Easter time. Tell us about things that we either no longer do or are done so differently today like making lye soap, butchering a goat, or making tesgüino. Do you have a family recipe?