Can we make cluster tree topology with 3 XBee S2C Module(1 Coordinator, 1 Router and 1 End Device)

I want a Star Network Topology but the range between coordinator and end device is beyond the range of XBee S2C module. Then I thought to use cluster tree like topology, where my all end devices will communicate to a central router and router will relay all datas to coordinator. Now can we establish such type of topology with 3 XBee S2C module? (Say one end device). Or we need XBee Digibesh kit? Is there any difference between XBee S2C (3 Modules) and components of DigiMesh Kit?

You can do that with the XBee 3 and XBee S2C modules using the Zigbee firmware.