Can you give us some standards? I recall 20 years ago when my ex was applying for a teach job, I told her to call herself Hispanic. Her mother was a Cuban immigrant, so she was "half" Cubarican. I vaguely recall that being up at least 1/8 Cubarican would be sufficient, but I can't say definitively that was the case.
She felt "guilty" about it, but I reminded her that unlike my mother, a pure-blooded American, her mother was an immigrant who spoke little English when she arrived as an adult. Her family was at a disadvantage even though her father provided for them just fine. Furthermore, she spoke the language and was familiar with the culture, both advantages as far as the school system was concerned.