Visitor Visa - B2

Hi, so today my aunt and cousin had their visa interview. When the officer called my cousin in, she was asked to give him her passport, which she did. Once the officer introduced her information through the computer, he asked her about her dad. Through her dad’s history, he went to the US illegally and got deported. Afterwards, the officer told her that her visa was denied due to insufficient information. However, the officer never asked her to show proof of her sponsor’s information. Similarly, my aunt’s visa was also denied because of her ex-husband. Please help with this situation.