that generally denotes a child customer

what is a child customer? how does this happen, and can we prevent it? the two "customers" are not related at all, and we didn't even know there /was/ such a thing as "Child Customer". Sorry for the long response time. missed your response as that was the day I left for holiday vacation.

as to why they are linked I am not too sure, however on the :1 customer is there a field called 'child of' or 'parent' with the other customer filled in there?