Tania Cardona claims Groening and his Argentinian wife Agustina rarely appreciated the work she did for them and insisted she and the couple's other Hispanic employees ate at a small table next to a trash can in the laundry room, according to TMZ.com.

Cardona also accuses Groening of criticising her poor English.

She is requesting millions in damages.

Groening's lawyer tells TMZ.com he has yet to see the lawsuit.