Freddie is Monica and Ross' uncle. He is married to Aunt Sylvia as stated in The One With The Dozen Lasagnas, where Sylvia ordered 12 lasagnas from Monica, but didn't like them since they had meat. When Monica asks her what do with them, Sylvia says something mean although we don't hear it. Monica replies by saying "Nice talk, aunt Syl. Do you kiss uncle Freddie with that mouth?"