O&U and disappointed, I am sorry to hear your news, but it is good that your children are taking it well, it's the most important.
You should not feel guilty of not having tutored enough. Unless you have found this site of course
, there is little advice around, and it is sometimes very difficult to find the borderline between over and unter preparing a child.
A place in a grammar school is far for being the only way to get a good education, but a strong parental support is vital, and I am sure that yourchildren will get plenty of it.