How can one answer an eight-year-old child's question about "Who are the Shia?" in a manner appropriate for their age and convincing to them, especially after their conversation with another child about sectarian affiliations?

It is said to a child who asks about the Shia that they are not good people, that they commit sins, and that they revile the Prophet’s companions and wives. It is explained to him that their actions, such as wiping over graves and celebrating Ashura, are impermissible, and that we worship Allah alone, prostrate to none but Him, and do not beat ourselves. The child is taught that we are Sunnis, following the Sunnah (definition) of the Prophet, peace and blessings be upon him, and do not innovate in religion. Some of the Shia’s deviations can be shown to the child through reliable websites.