After almost 31 years of marriage, the parents of Beyoncé and Solange, Mathew and Tina Knowles, have reportedly split up.

According to TMZ, Tina Knowles filed for divorce from her husband Mathew in Harris County, Tex., last month, in an attempt to end their marriage. The filings say Tina and Mathew “ceased to live together as husband and wife on or about January 5, 2009,” the exact day of their 30th wedding anniversary.

In October, a paternity suit was reportedly filed against Mathew from a woman named Alexsandra Wright, who claimed to be six months pregnant with Knowles’ child. It is uncertain if that led to their separation.

Mathew and Tina have both been instrumental in the careers of their children. Mathew runs the record label Music World Entertainment and manages his daughter Beyoncé. Tina Knowles is a stylist and one of the founders of House of Deréon, a fashion line she helped launch in 2004 with her eldest daughter.