wireless roughter conflict with home secerity system

Ok so my dad just got this new home wireless security system and every night he turns it on around 9pm. when he goes to bed and doesnt turn it off untill about 8am. now as soon as he turns it on the whole house looses internet since we’re
set up wirelessly. My question is how can i prevent this? is there a way i can set up my system so that the wireless internet does not confilct with the wireless security system.
:note that 2 of these cameras (out of 5 or 6)
are infered.