What are the oversubscription (admissions) criteria for the school that you would like your DC to attend? (Look at their website under 'Admissions' - it may well link to an LEA document or it may be directly on the website.
These are what they will take into account when allocating places - by law, they HAVE to follow these and they CAN'T prioritise admissions to someone unless it is in line with these criteria.
Most schools have a fairly standard set of these criteria e.g.
- Children with a statement of SEN naming the school.
- Looked after or previously looked after children.
- Siblings of those who will be in the school at the time of admission
- All others by distance
Some schools have faith criteria, others have a fixed catchment or priority admissions area, iothers e.g. junior schools give priority to pupils who have attended a linked infant school.
A few have 'Social / Medical needs' as an admission criteria - does the school that you are interested in? If so, it is almost always the social / medical needs of the child, not the parent, that are taken into consideration in deciding whether any priority is given, but very occasionally the needs of a parent are mentioned (or not excluded) by the criteria.
IF the school has 'Social / Medical needs' as a category within the admissions, and if these include needs of the parent (not just of the child) then it is possible to constrict a scenario in which your situation might be taken into account. However, if the oversubscription criteria are the 'standard' ones above, or the standard ones + faith, then there simply isn't any leeway for the LEA to over-ride the determined admissions arrangements for that school to give you priority for a place.