Family Guy (1999)

S6E6 Padre de Familia

After getting swept up in the patriotic fervor at a Veterans' Day parade, Peter forms an anti-immigration group. However, his perspective shifts dramatically when he discovers he was actually born in Mexico. Faced with the inability to prove his citizenship, pass the naturalization exam, or persuade officials that his marriage to Lois is genuine, he winds up taking a job as a groundskeeper at his father-in-law's estate. Ironically, he then becomes a passionate advocate for immigrant rights.