Interesting topic, and great question for someone to ask, especially a youngster! I like the way you tackled the comparison there.
Our moon is also quite large when you compare it's diameter to that of the earth.
I seem to recall reading somewhere our moon is the largest in the solar system when compared that way, ie moon diameter against parent body diameter. Now that Charon and Pluto no longer officially form a planetary system I don't there's anything else that even comes close.
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