I am having a problem in creating a report type. Before the problem, let me explain the relationship between the objects.

I have object A as child of Account and object B as child of A. So its like Account -> Object A -> Object B. I need to create a report with the details from Account, Object A and Object B. This can be done using report Type. However, it is also required to summarize the information based on the roles defined in Account Team. This kind of relationship cannot be created in Report Type. 

Is there any way, that this is possible to do using Out of the box functionality? If not, what are the alternatives?

Regards,

Rajesh