Here's more information I just received...
Luke was driving, with Ethan in the front seat, Anna and Julia in the back, with Anna directly behind Luke. Apparently, and they are still piecing details together, a semi truck going the opposite direction lost a rear wheel, which traveled directly into the Hausmanns vehicle, shearing off part or all of the top. Ethan managed to pull the emergency brake, thus probably preventing a worse accident. Apparently Luke was killed instantly. Julia suffered some minor cuts and bruises and was with Abbey and the younger children at their aunt's house in the Waco, TX area when I called. Ethan has lost front teeth and sustained other injuries, however, not life threatening.
Anna, who is scheduled for surgery at 10:00 this morning, sustained head trauma, damage to one eye and has numerous glass particles/fragments embedded in her face. She is, as of my conversation with Abbey around 8:30 this morning, in stable condition. They do not believe at this time there will be brain damage where Anna's concerned, and doctors are hopeful they can repair the eye satisfactorily, though there is concern she could use some/all use of it. Last night they were mainly concerned with stopping internal bleeding.
Dave spent most of the night in Anna's hospital room maintaining a constant vigil and communication with Anna who, as we understand it, showed signs of knowing who he was. She also spoke some with her sister Julia at the accident scene, while waiting for the ambulance(s) to arrive. Later, at the hospital, she was able to squeeze a nurses hand firmly with her right hand, not so firmly with her left. She has obviously been heavily sedated and so her true mental state/facility is difficult to determine at this time. They (Anna and family) are at Hillcrest Baptist Medical Center in Waco, TX.