Hi I want to delete custom object records and also case records when account is deleted using trigger. Undelete the child records if account is undeleted the trigger works only for custome objects but case records are not deleted and undelted .Below is the trigger code.

trigger OrderDeletion on Account (before delete,after undelete) {
    
    List<Id> AccIds= new List<Id>();
   
    if(trigger.isbefore && trigger.isdelete){  
        for(Account acc: trigger.old){
            AccIds.add(acc.id);
        }
        List<AccountOrder__c> ordlist=[select id,name,AccountOrder__c from AccountOrder__c WHERE AccountOrder__c in:AccIds];
        if(ordlist.size()>0){
            delete ordlist;
        }
        
        List<Case> caselist = [select id from Case where Account.Id in:AccIds];
        if(caselist.size()>0){
            delete caselist;
        }
    }
    
    if(trigger.isAfter && trigger.isUndelete){
        for(Account acc: trigger.new){
            AccIds.add(acc.id);
        }
        
        List<AccountOrder__c> ordlist2=[select id,name,AccountOrder__c from AccountOrder__c WHERE AccountOrder__c in:AccIds AND isDeleted = true ALL ROWS];
        if(ordlist2.size()>0){
            undelete ordlist2;
        }
        
         List<Case> caselist1 = [select id from Case where Account.Id in:AccIds AND isDeleted = true ALL ROWS];
        if(caselist1.size()>0){
            delete caselist1;
        }
    }
}