How to check if a Zigbee router is receiving a specific End node?

I have a Zigbee network with an end Node that should reach the coordinator through a router.
I have xctu connected to that router.
Which is the simplest way to check if the router is receiving the packets transmitted by the end node to the coordinator?
Being the coordinator address being set in the end node destination address, I do not see end node packets on the router XCTU console.
Many thanks for the attention.

Query the Child table on the routers.