Lucy

Aunt Lucy is Arthur, D.W., and Cora's Aunt who appeared in D.W. Thinks Big. She is the sister of Jane, Jessica, and Fred and the daughter of Grandpa Dave. She is also the sister-in-law of David, Loretta, Richard. In D.W. Thinks Big, Aunt Lucy is getting married and has Arthur be the ringbearer and Cora be the flower girl in the wedding but she doesn't ask D.W. to be in the wedding possibly due to D.W.'s age. On her wedding day as Aunt Lucy gets pictures taken with her and the people in her wedding D.W. asks her if she can help the next time she gets married making everyone laugh. At the beginning of the wedding as Arthur and Cora walk down the aisle Arthur loses his balance and accidently throws the wedding ring into the piano pipe organ. Arthur tries to go in and get it out but can't due to his size and Cora refuses to go in the organ because it's so dirty so D.W. goes in and gets the ring because of her size. Because of this Arthur lets D.W. carry the ring and Aunt Lucy takes off Cora's crown and places it on D.W.'s head making her the flower girl too. At first Cora starts to complain but when Aunt Lucy says Cora. Cora replies Oh All Right. After this Aunt Lucy finally gets married and before she and her husband leave Aunt Lucy gets her picture taken kissing D.W. on the cheek. She also tells D.W. that they wouldn't of been able to of done it without her help. At the end Aunt Lucy is seen leaving for honeymoon with her new husband. Aunt Lucy isn't seen in anymore episodes after this but is mentioned sometimes by Arthur and D.W. in later episodes.

Trivia
In the episodes Go to Your Room D.W. and D.W.'s Perfect Wish Arthur and D.W. call Lucy their cousin instead of their aunt but she is really their aunt because she's their mom's sister.