It is difficult when your children are at school.
Our boy is Autistic and goes to a special school, the benefit he gets from the holiday though means there is no problem going out of the normal holidays. The school are okay about it.
We would love to go in August but to be honest it's just too hot and too crowded.
Too crowded at Easter also.
We have settled on late April early May now, because the temperatures are not too stifling, parks are not too busy and fly drive/accomodation prices more reasonable.
Guess October half term would be okay too.