Singer-songwriter Holly Williams and sister Hilary Williams were being treated at a Memphis, Tenn., hospital Wednesday night (March 15) for injuries sustained earlier in the day in a traffic accident between Memphis and Tunica, Miss. They are the daughters of Hank Williams Jr. and his ex-wife, Becky. According to WREG-TV in Memphis, the sisters were traveling south to Bastrop, La., to attend funeral services for their 87-year-old grandfather, Warren White, who died Monday. Both Hank Williams Jr. and his ex-wife spent much of Wednesday night at the hospital where Holly was listed in fair condition. Older sister Hilary was listed in critical condition and was scheduled to undergo surgery. WREG-TV reported that the vehicle transporting the sisters apparently rolled over several times. Holly Williams released her Universal South debut album, The Ones We Never Knew, in 2004. She has been working on a new album and was scheduled to travel to Europe next week for promotional appearances in Germany, Austria and Switzerland.