Hi there, welcome to the forum, but so sorry to hear about your partner's Mom. It doesn't sound like she is doing very well and you seem to be expecting her medical team to advise you and your partner of the present state of her illness. Have you and he talked about her disease up until now, and if so, does it seem as though he may be aware of the seriousness of her disease? I would just ask him what he thinks the medical team want to  discuss with you and he. Depending on his response, you might want to just tell him what you are expecting to hear tomorrow. Probably hearing this possible news from you might give him time to prepare for the bad news he's likely to hear tomorrow.

I know you're concerned about his ability to handle bad news about his Mom and there may not be any easy way for him to hear that. Unfortunately, this kind of news is really hard to hear for anyone, and for most of us, we have, or will hear it one day. You seem to be a good support to him through this and I know you will help him through this. Remember though, you can't do this for him; he has to do this his way and he will, with your support.

Good luck with it and come back and let us know how you get along.

Take care.

Lorraine