Elizabeth Pena and Stephanie Beatriz will guest star on ABC's "Modern Family" as Sofia Vergara's character's family, the executive producer said.

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Pena, who was in "La Bamba" and "Rush Hour," will play Gloria's [Vergara] mother while Beatriz, who has appeared on TNT's "The Closer," will play her sister, Entertainment Weekly reported Friday.

"There's a bit of a competitive relationship between Gloria and her sister that will be fun," executive producer Christopher Lloyd told EW.

"The mother is the formidable, domineering character in the family, and has a complicated relationship with Jay [Ed O'Neill]. I'm not sure she's ever completely accepted Jay, and they lock horns in the episode."

The 12th episode, "Fulgencio," begins shooting Monday.