You really need to have him seen by a vet, is he crackling or clicking when he is breathing? The discharge from his eyes and the noisy breathing would say URI to me, does he have a crusty nose? But without proper vet diagnosis he cannot get the treatment he needs, so he will suffer, potentially to death.
It is your parents responsibility to make sure that pets are given the correct treatment and care they need. If they cannot provide this i would suggest surrendering your pet to a rescue and making a donation towards his care.
Please have him seen by a vet, i dont think you want him t suffer, he could be very uncomfortable, he deserves to be made better. Most vets set up payment programmes so that you can pay bit by bit or at a leter date.