A merchant wishes to have a storefront for adult sized products and another for children's...

According to the Adobe Commerce Merchant Documentation, you can create different category structures for different stores within a website by assigning different root categories to each store. You can also create different store views for each store to manage different languages or designs. Therefore, you can create one website with two stores and two store views each, and assign different root categories to each store.

References: https://docs.magento.com/user-guide/catalog/catalog-root-category.html https://docs.magento.com/user-guide/stores/stores-all-create-store-view.html