Grouping Trouble

P

Please help me..

I need to group 30 records by Child name or Child Id, the problem is that I
set the Group interval to 30 but the child id's are not sequential based on a
query and I get 11 records or 23 sometimes. I want the query to return 40
records and group the children in groups of 30. Could I number the records
in my crosstab query and group on that number. Please tell me how.
 
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