I would personally appeal all the schools you want places at prioritising the school your youngest is at.
Appeal straight away and make sure you son in on the waiting list at each school straight away.
why were the original schools rejected, this will help understand what you focus on.
We successfully won appeals for our yr4 & yr6 DDs this year, both are in class sizes of 32, I think one is 34. The year groups are only 15 normally but they mix years, currently year 5 & 6 together, so the appeals board had to not just consider class sizes for this year but next year too where class sizes exceed 15.
Our main focus was religion (catholic school, baptised catholic children) and mental health for our 8year old. It helped that our youngest had got a place in reception on the waiting list, so having a sibling already in the school bumped us up the criteria list.
Our situation was different as we had previously attended the school. This was also a focus of our appeal, our DDs mental health had suffered since leaving the school.
The appeals board had to consider the effects of putting another child in the class on the other children i.e was there enough resources in the class that it would not adversely effect the other children. It really helped that the HT was on our side and wasn’t putting up a fight to keep us out. She obviously had to do her spiel on why the application was rejected but didn’t argue against the appeal.
It’s hard but keep emotion out of it, focus on the facts, speak to the school about what to focus on. They will just be following protocol rejecting the application, it dosnt mean they are against your son joining the school. How many children are currently in the class vs teachers & TAs.
Whats the schools admission criteria, where do you fall with in that. Is there anything on that criteria that you haven’t used.
It dose sound like you have a crap LA admissions department, keep on at them, phone and follow up with emails. Do you have grounds to complain, hold the LA responsible for missing out on places due to their delays in dealing with your application?
good luck