Aka; Pest, shadow, second attempt at a decent child, little bother.
Generally smaller. Quite annoying at times and seems to take great enjoyment in copying your everymove.
Felix: "Mm I'll have a strawberry icecream with walnuts and chocolate chips please."
Younger Brother (Is allergic to nuts): "Can I have a strawberry icecream with walnuts and chocolate chips?" (Innocent smile)
Felix (sigh): "Ehh..." (gives up)
-Result: Little brother in hospital and Felix grounded-