Squibs

Some children born to wizarding families would never come to display any magical talent or skill whatsoever. Essentially the reverse of Muggle-borns, Squibs were effectively Muggles forced to live in the wizarding world but unable to fully access it, although they were able to see things hidden from normal Muggles. Some children were revealed as late-bloomers rather than Squibs, such as Neville Longbottom, but for others (such as school caretaker Argus Filch) their magic would simply never materialise, which could be hard to accept.