Can anyone identify this inner ear condition by the test?

My father & my sister (different appointments years apart) went to ENTs for occasional dizziness & both were given the same test & diagnosis. The ENT blew air into their inner ear & they felt like the room was spinning to the point of nausea. My sister said her ENT had given her some eye exercises (something like looking up & down several times) to help correct it. It is hereditary & it appears that I most likely have the same thing. My sister can’t remember what it is called & can’t find the exercises & I’d rather spare myself of the very unpleasant test & ENT appointment/test costs. Anyone able to identify the condition?