is common if you have a family history.
what your son is having is classical migraine with aura.
you need to look out for symptoms of hemiplegia
worsening like weakness of arms etc.
do not worry as most symptoms he had was of classical migraine.
but i would advise you to take him to a physician if his symptoms become worse or more than the previous attack.
i hope i have answered your query. take care and thanks for approaching HCM.