On lead object, I have a trigger that will create two contacts, now I want to catch those two created Id's and create a record in Relationship__c object. On relationship object I have two fields Contact1__C and contact2__c, I want to pass two newly created contact id's after inserting in trigger to Contact1__c and Contact2__c fields in Relationship Object.

Can anyone help me out in this issue, my code is below.
 

trigger CreateContact on Lead (after insert) {
    
    List<Contact> conInsertList = new List<Contact>();
    List<npe4__Relationship__c> relation = new List<npe4__Relationship__c>();
    List<String> listEmail = new List<String>();
    
    for (Lead em : Trigger.new) {
        if(em.Email != null){
            listEmail.add(em.Email);
        }
    }
    
    List<Contact> cem = [SELECT Id, Email FROM Contact WHERE Email = :listEmail];
    String cemail;
    for(Contact ce : cem){
        cemail = ce.Email;
    }
    
    for(Lead ld : Trigger.new) {
        if (ld.Email != cemail && ld.Parent_Fill__c == false) {
            
            Contact cnt = new Contact();
            cnt.FirstName = ld.FirstName;
            cnt.LastName = ld.LastName;
            cnt.Email = ld.Email;
            conInsertList.add(cnt);
        }
        else{
            if(ld.Email != cemail && ld.Parent_Fill__c == true ){
                Contact cnt1 = new Contact();
                cnt1.FirstName = ld.Parent_First_Name__c;
                cnt1.LastName = ld.Parent_Last_Name__c;
                cnt1.Email = ld.Parent_Email__c;
                conInsertList.add(cnt1);
                Contact cnt2 = new Contact();
                cnt2.FirstName = ld.FirstName;
                cnt2.LastName = ld.LastName;
                cnt2.Email = ld.Email;
                conInsertList.add(cnt2);
            }
        }
    }
    
    if(conInsertList.size()>0){
        INSERT conInsertList;
        List<Id> conInsert = new List<Id>();
        for(Contact con : conInsertList){
            conInsert.add(con.Id);
        }
    }
}