All the grandchildren wanted others, and Grandpa ate three of them

Sentence:
“This sentence looks like a riddle or a joke that plays with words.”

Possible interpretation 1: Secondaries and their theft
The meaning of the word “secondaries”:
It can refer to other portions of food, such as other pieces of cake, other portions of soup, or other food that family members still want.
Situation:
The grandchildren wanted their “secondaries” (another portion of food).
However, Grandpa took three of them—that is, he ate three of their portions.
Conclusion:

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