I am working on a PC which is connected to my router using a LAN cable, and the other computers in my house are connected to my router using WiFi. 

We are all connected to the same network, so I assume that the answer to my question will be yes, but when I run Wireshark it doesn't capture packets sent from the other devices connected via WiFI.

Can I sniff the packets being sent to and from the wireless router even though I am connected through cable?