Answer:
(A) I would first check if the wireless connection is using the fastest wireless standard the router supports, and if it is I would then (B) enable QoS for the gaming application on the router and on the son's computer. However, if that is not enough and wired cabling is feasible, (C) I would then recommend using wired Gigabit Ethernet connection from the router to the son's computer.
Step-by-step explanation:
Firstly, I would need to confirm if the available wireless connection is the fastest connection available for the router. Then, I would ensure that the QoS is enabled for the application. Lastly, I would ensure that the wired Gigabit Ethernet connection is used for the system. This will ensure that the gaming experience is as fast as possible.