Hi
I cant post long right now but will try to add extra info tomorrow

If your dad developed TS after Scarlet Fever then yes, as mrsD has pointed out, he most likely had a condition known as PANDAS (Pediatric Autoimmune Neuropsychiatric Disorder Associated with Streptococcus) which mimics the tics and OCD symptoms usually seen in TS. If there is also a family history of Tourette Syndrome, along with strep, then the inflammation caused by the bacteria can intensify the overall manifestation.

Was there anyone else in the family with tics or OCD? TS is genetically inherited

It is very sad how many people are misunderstood because of their Tourette symptoms, more so in the past. Kudos to your dad for moving forward despite that treatment by the school. Nowadays Tourette Syndrome is covered by the Americans with Disabilities Act for all education and by law kids with TS need to be afforded proper accommodations to help them succeed at school.