Ethernet cable

Hi,

I have a very long Ethernet cable going from my router which is downstairs going up the side of the house into the loft and down into the bedroom running a smart tv, what I want to know is in my son's room which is about 4 feet away he has Xbox and smart tv, rather than run another cable up the side of the house into his room can I run an Ethernet cable from his room and link it into my room and if so what it it I need to get aswell as the cable?

I know about tp link but I would rather do it the way I have explained

Thanks
 
I'm not sure, is that something I can put in the bedroom that the Ethernet cable is in and then run other cables to it?
 
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