ninathenana
I know you said you won't comment here again and I sense how hurt you are but I am hoping you might come back to look.
I'm a big WhatsApp advocate for staying in touch. If he could have a "smart" phone with WhatsApp (or similar) for no charge at all they could send him little funny photos, messages, and other "thinking of you" things. They shouldn't really be expecting a response I feel but should just regularly reach out gently to him. Who knows, maybe he'll send something back now and again...
As others have said, life for everyone in the family at the moment must be tough, and at 9 you are old enough to know a lot and understand much less.
I hope there is a way forward for you and your family.
X