I’m so sorry to hear about the death of your partner’s dad during lockdown and how it is affecting him, and impacting your relationship. It sounds as though you have a lot of additional stress in your lives, with his job loss and a house move to deal with.
Anger can be a common part of grief, but it sounds as though this is being unfairly directed at you. It is sad to hear that he won’t talk about his loss, or consider counselling, as it is really important to have outlets for grief. When someone bottles up emotions that can certainly be a factor that can make anger worse.
Unfortunately, it isn’t possible to make him get support if he really isn’t willing, and it does sound as though you are doing your best to talk to him about this. Have you told him directly that he is risking destroying your relationship?
I hope that you’ll get some other helpful replies from members of this community, but I just wanted to suggest a couple of conversations from last month that you might find relevant to read or reply to:
@Becky1982 posted How can I help my husband after him loosing his dad?
@DeniseC posted Husband grieving and angry