Your mother is naturally struggling as she is having to face the difficulties constantly, and you find being there for a short time unpleasant so no wonder she gets mad. One or two small suggestions. Firstly having a small notebook and pen each, so that things that really matter can be written and then no shouting needed to comprehend the main points. Then is there a possible small compromise, where your father wears his hearing aids for an hour say, in the morning and that hour used to discuss the days events and anything of importance and then back to the notebooks. With something like this your mother at least would get a bit of a break from the shouting, and eventually they might learn to use this hour in the future for anything they needed to talk about. Then I think your mother needs to get away each day for at least a short time , either a walk or visiting a friend or whatever just so that she can have a little "normal" time, which can allow her to feel a bit less stressed., as constantly trying to deal with the deafness means that you can be under stress all the time. Definitely if your father wont wear hearing aids I would look into headphones that can be used for tv or radio so that at least he is not deafening your mum or neighbours. If he is not prepared to even attempt to do something like this then your mother may need to resort to just writing notes and staying away from him more. If he objects to this she will explain that in order to cope with the situation it is the only way she can manage.As this is going to be an ongoing situation these seem to be the sort of possible things they might agree on. If they cannot come up with some sort of a plan , given the stress they are already under , you may find that your mum will crack up under the strain and things could be worse. My husband took some time to accept that he had hearing loss and not just minor. Once he accepted that this was the situation we used some of these ideas to help us both We worked out a way to live together , but he was willing to make some effort and I in turn, accepted that there were places and such things as big groups of people that were no longer possible to go to for him. I also talked to other people who were living with someone who was deaf to get any ideas that they might suggest too . One simple idea someone told me was that they used to go shopping together. Now he goes to the supermarket with a list where he switches his hearing aids off and just gets things from the shelves and puts them into the trolley. She goes to places like the bread shop or the greengrocers where she speaks to the staff and they meet afterwards in a coffee shop, which does not have loud music playing and by now the staff know what they usually have.