I go through the public health system so only outside contact is to discuss the next appointment etc by txt/phone.

But I do write letters and leave them at reception to be put in his work mail box. It gives me a chance to say things that are hard to say face to face. Once during an extra hard session he left a letter for me and sent me a txt saying I had mail. My dad never spoke of the one letter I gave to him so it meant something to look in my mailbox and find that letter.