However, it was during this wedding a viewer noticed something odd and took to Reddit: “During her wedding only her Mother, Father and Brother came, but in one of the episodes Penny also mentioned that she had a sister.
“She said something along the lines of my father wants to dance with his daughter during her wedding, he almost did it at my sister’s wedding, but her water broke.
“So did they just forget about her or what happened? Like a fallout or something.
“It is also mentioned she shot her husband when she was drunk.”
source: express.co.uk