What does the fortune teller mean when he says it's grandma's maid?

Who are the two children standing next to grandma Taishan?

One is a disciple of Bi Xia Yuan Jun, and the other is a maid. The Queen of Mount Tai, namely Bi Xia Yuan Jun, the legendary goddess of Mount Tai, is also the god worshipped by Taoism. "Yuan Jun" is a Taoist honorific title for female immortals, and people call it "Grandma Taishan", "Empress Taishan" and "Mother Taishan". Bi Xia Yuan Junjiao flourished in the north of China. There are three temples on Mount Tai dedicated to Yuan Jun, Bi Xia. Bi Xia Yuan Jun is kind-hearted, holding a water board in his hands. The maids stood on both sides with their hands in their wings. Below it are the goddess of birth and the goddess of vision. A maid stands beside them, holding an eye and a boy as their symbols respectively.