Who is Tom and Maria in poem lamplighter?

Tom and Maria are two children who appear in the poem "The Lamplighter" by Robert Louis Stevenson. Tom is the younger of the two, while Maria is the older. The poem describes the children's evening routine of watching the lamplighter come to light the street lamps in their neighborhood. The children are fascinated by the lamplighter and his work, and they eagerly await his arrival each night. The poem portrays a sense of nostalgia and childhood wonder, as the children find joy and enchantment in the simple act of watching the lamplighter.