Ekasuky Sato (マサオくんのママ) is the mother of Masao, she is a little plump. Her face looks almost identical to that of Masao. She plays tennis and video games, and is fan of South Korean celebrities. She lives with Mr. Sato and Masao in a house close to that of the Nohara family.
She gets along pretty well with the rest of the boys' mothers, especially Misae. Like all of them, she likes gossip, shopping and working as a housewife.