Agnes Skinner is Principal Seymor Skinner's very controlling elderly mother. Agnes was actually revealed to have adopted Seymour during "The Principal and the Pauper." Agnes also often serves as a friend of Marge in many adventures.
Principal Skinner: (thinking) I know you can read my thoughts, Bart. Just a little reminder. If I find out you cut class, your ass is mine. Yes, you heard me. I think words I would never say.
Homer: (thinking) I know you can read my thoughts, boy. (singing) Meow meow meow meow, meow meow meow meow, meow meow meow meow meow meow meow meow.
I was in love with a soldier boy on leave from Korea. It was a fifties style of romance, five minutes of sex and a lifetime of regret. He went back to his war and I went back to my dream of pole vaulting in the Helsinki Olympics. But there was a bump in the road, a bump named Seymore.Agnes [in flashback]