Mathew Knowles revealed the news in an interview with Michael Strahan. on ABC's 'Good Morning America' on Wednesday. . This is genetics. It also means that my kids have a higher chance, even my grandkids have a higher risk. And they handled it like they should. They went and got the test, Mathew Knowles, via 'Good Morning America'. Knowles is the father of Beyoncé and her sister, Solange. . Knowles previously worked as both Beyoncé and Solange’s managers . and is best known as the former manager of Destiny’s Child. . Knowles and Beyoncé's mother, Tina Knowles-Lawson, divorced in 2011. . Knowles-Lawson is now married to actor Richard Lawson, . while Knowles is married to Gena Charmaine Avery.