Hi unstuck, not sure what part of the world you live in but I deal with this type of thing in my professional life in UK and also had personal experience of similar a couple of years ago for different reasons.
Firstly be a visible presence on the ward, ask DRs and nurses yourself for updates and ensure they and any social workers involved have your details. Make them aware of the issues and stress you want to be involved in any case meetings. In UK you could ask for an advocate for your father to ensure his wishes are heard neutrally on the basis that you are a family in conflict. If your father has any form of dementia or similar the Hosp /social care should be holding a meeting with wider family to support best way forward. To be invited to these they need to be aware of you. Avoid speaking to awkward other relatives, deal directly with your father and medical/social team.
At the end of the day you can't force a person not to shun you. Its a bike doctrine and a bike organization try and protect your own emotions at the moment you have enough on your plate.