[
    SELECT Name
    FROM Account
    WHERE Id != :opp.AccountId
        AND Id != :opp.End_Client__c
        AND (
            Id IN :accountIds
            OR ParentId IN :accountIds
            OR Parent.ParentId IN :accountIds
            OR Parent.Parent.ParentId IN :accountIds
            OR Parent.Parent.Parent.ParentId IN :accountIds
        )
    ORDER By Name
]

[
    SELECT Name
    FROM Account
    WHERE Id != :opp.AccountId
        AND Id != :opp.End_Client__c
        AND (
            OR Parent.Parent.ParentId IN :accountIds
            OR Parent.Parent.Parent.ParentId IN :accountIds
        )
    ORDER By Name
]

[
    SELECT Name
    FROM Account
    WHERE (Id != :opp.AccountId
        AND Id != :opp.End_Client__c
        AND Id IN :accountIds)
    OR
        (Id != :opp.AccountId
        AND Id != :opp.End_Client__c
        AND ParentId IN :accountIds)
    OR
        (Id != :opp.AccountId
        AND Id != :opp.End_Client__c
        AND Parent.ParentId IN :accountIds)
    OR
        (Id != :opp.AccountId
        AND Id != :opp.End_Client__c
        AND Parent.Parent.ParentId IN :accountIds)
    OR
        (Id != :opp.AccountId
        AND Id != :opp.End_Client__c
        AND Parent.Parent.Parent.ParentId IN :accountIds)
    ORDER By Name
]