It was probably scared away by Uncle Louie. A combination Santa/boogeyman figure that my parents told me about.
If you shared with/were kind to your brother then Uncle Louie saw and told your parents. You got the bigger bowl of ice cream. Nice things would occur.
Uncle Louie was also who we were likely to be given away to when naughty. He'd also snitch if you hit your brother.
Uncle Louie was invisible so it was difficult to tell if he was around and watching.
On an amusing note I was browsing the gift cards one day at University and came across a good one. The outside read "blessed are the pure of heart, for they shall see" and the inside said one name. "Louie"
I immediately bought it and sent it home to my folks.