These three girls talking in the chat box were Evan's elder sisters. Myla Smith is the eldest sister of Evan, Carrie Smith was the second eldest sister of Evan and Ava Smith was Evan's third oldest sister. Evan Smith was the youngest son of the family and his three sisters loved him very much.
He was very fond of his three sisters. His two eldest sisters were married and the third eldest sister is single. Many things about those three sisters matched each other. All three were modern and independent girls who were very passionate about their careers. And at the same time, they were also the one to handle there brother's tantrums.
All three of them were somewhat possessive about their brother. All three failed to convince Evan to answer their questions. And on the contrary, because of the word that there is Evan's child, they had trapped Andrew in this matter who sometimes checks Smith's family group chat.