Mrs. Risotto

Mrs. Risotto is the mother of Luigi.

History
When Homer eat at Luigi's so much so he starting making Luigi broke starting Luigi Risotto's mother be upset.

When Marge told Homer that he could eat anything he wanted at Luigi's, Luigi called on his mother, who was at Bingo, to help out.

Non-canon
Luigi stated "I could get my mustache caught in the oven. That's how-a mama died!".