Is called a squib.
A human.
You can call your child whatever you want I mean it's yours.
Two children born at the same time to the same mother are twins:three = tripletsfour = quadrupletsfive = quintupletssix = sextupletsseven = septupletseight = octupletsnine = nonupletsten =...
In the realm of the Harry Potter wizarding world non-magical people are called MUGGLES
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