Round 1:
https://www.behindthename.com/bb/game/5191330Round 2:
https://www.behindthename.com/bb/game/5192254Round 3:
https://www.behindthename.com/bb/game/5192811Round 4:
https://www.behindthename.com/bb/game/5192814-
(throughout the game, genders will be your choice or you can use a dice roll/coin flip)
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Twins!
Twin 1: snowflakes or icicles?
snowflakes: FN starts with a vowel / MN is a tree
icicles: FN is related to SO1's middle name somehow / MN starts with "Le", "Ev", or "Cas"
Twin 2: snowshoe hares or snowy owls?
snowflakes: FN is related to SO1's first name somehow / MN starts with "Am", "Jo", or "Mat"
icicles: FN starts with I, C, or E / MN is geographical