How can i tell my mom what type of breed my two cats are?

the cats are brother and sister and the brother is black with a tint of brown and his chest has little white hairs and the sister has a tortieshell type look but is a calcio because it has white hairs when my mom told her co-workers that they eat, run, play and misbehave the co-workers told her that the cats might... show more the cats are brother and sister and the brother is black with a tint of brown and his chest has little white hairs and the sister has a tortieshell type look but is a calcio because it has white hairs when my mom told her co-workers that they eat, run, play and misbehave the co-workers told her that the cats might be a maine coons but being in four-h cats that they are not maine coons cause coons have long hairs and these cats have short hairs but of course they are big compare to my oldest cat which is a blue (black with gray) and white tuxedo tabby cat and she is small like peitie so how should i explain to my mom who has no idea in cat breeds
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