"You know how parents are." Though he suspects that James, being the mostly good person that he is, doesn't have to deal with his parents punishing him the way Sirius' does. Sirius doubts any of his friends are as terrible and therefore as frequently disciplined as he is, "Mum and Dad and I had a row pretty much every other night I was home, and they hid all the bruise cream, so 'm a bit of a mess."
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"You know how parents are." Though he suspects that James, being the mostly good person that he is, doesn't have to deal with his parents punishing him the way Sirius' does. Sirius doubts any of his friends are as terrible and therefore as frequently disciplined as he is, "Mum and Dad and I had a row pretty much every other night I was home, and they hid all the bruise cream, so 'm a bit of a mess."