hmc - please don't take Pedant's Corner personally.
So sorry your dc has been diagnosed at dyslexic.
I'm sure no-one here would aim to offend anyone with dyslexia any more than they'd want to offend a person who can't hear/see etc etc.
The pull here is on people who make mistakes for no other reason than they have the ability to spell, write etc but don't bother/can't be bothered.
I can understand why you've posted this but please don't be offended as none would have been meant.