NZ Super Rates

This may entirely not be the case as my family is notorious at not providing full details but my stepmother has just turned 65 and applied for the NZ super. She will continue to work. My father (married) is only 62 so doesn't qualify yet. Apparently my stepmother has been advised she will only be entitled to $100 a week due to including my fathers income in the application (like $60k annually). From what I can tell online, she should be getting half the married rate? Can anyone confirm? Thank you