Alex's Accident

Not sure how many of you have read my Facebook post about what happened today. So I will post the full story here as far as I know.
Today after school Alex and Joshua were crossing the street to come home. They ride their bike to and from school everyday. They are both in Middle school now. Joshua in his last year and Alex in his first. School started last Monday. To give some background first Joshua has been ridding his bike for a year with no problems. Here they do not have crossing guards for middle school. Well as usual they check for on coming traffic saw it was safe to cross and proceeded. Well the on coming car thought he/she could get across before them. well it did not happen and Alex was hit. The driver was not going fast at all. He was hit on his right leg which knocked him over.
Once Alex got up and out of the way the driver took off. They came home. This is where they tell me this. I called to police to file the report. I had police paramedics and the fire department here filling out reports and checking Alex out. The paramedics felt that Alex was well enough to stay home in my care. Gave me instructions and what to look out for.
Well now is where everything gets worse. I call to tell Brigett (Alex's birth mother). Of course the number I have is no longer in service. So I call her mother no answer. So I text Sean and he gives me the correct number. After talking to her telling her that all is well explained everything. Well later this evening I noticed I had a few messages on the phone. One is from her mother the other from Brigett. I call Patti back and explained everything. She made me feel horrible like there was something I could have done to prevent this. So I get off the phone with her and returned Brigett's call. She wanted to speak with McKay. But he has to be at work at midnight tonight and was in very early this morning he had already gone to bed.
After things where said. It made me think why could it not have been Joshua. It would have been so much easier.
Granted I did not HAVE to call anybody. But I thought it was the right thing to do. But to hear about it the day it happens then later on I thought.