All in the Family S04E20 - Lionel's Engagement

Edith, Mike and Gloria are each extended a special invitation to attend Lionel's engagement party. However, Archie isn't invited, that is until a big argument between Louise and George results in Louise deciding to invite him. Later, during the party, George is in for a big shock when it turns out that Lionel's fiancée, Jennie has interracial parents.