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I like to imagine that Luna and the twins have arguments about who's really the older one AKA who should be in charge when they hang out
the fact that Luna Maximoff was literally born before Billy and Tommy but bc of the retro-reincarnation* the twins are full grown adults and Luna is still a middle-schooler.
*nobody in the mid-2000s was playing close enough attention to the timeline, also because Luna is the Franklin Richards of Atillan and will never age.