Chapter 1: Page 9: Line 39

 "Mother says you're the Family outcast," Pitt remarks.

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Line 39 Vulgarized:
"Mom says you're a failure and the black sheep," says Pliny because his mom isn't close enough to smack his mouth shut.

Subtext:
Cherrycoke is telling a story about himself in front of family which means they know more about him than his usual audience. They're apt to call out any lies or embellishments. Also, they apparently don't mind simply insulting him and selling out his sister as a mean-spirited gossip.
    How trustworthy is Pitt and his mother is probably a good question to ask! Who knows what grievances Cherrycoke's sister has against him. Maybe she's just jealous of his adventurous nature and would rather see him as having been banished from their family home? Or maybe her remark was just some joking line to her husband which Pitt overheard? Whatever the case, it's obvious Cherrycoke was an outcast. But was he driven away by hurt and angry family or was it his own nature that drove him on his merry way?
    I, for one, won't trust one word that comes out of either creepy twin's mouth. My body just shuddered in physical disgust! Twins are monsters (especially these two, although that's a pretty thin "especially" considering how monstrous twins are).