Australia here.
My Father in Law beat Leukemia about 18 months ago after a 2 year battle. As we are aware, you're never totally out of the woods. He now has a blood problem that was brought on by some delayed reaction to the chemo. In order for treatment, they say he has to have the vaccination first. I was blown away, does this sound right? BTW, the treatment of the Chemo reaction, is a low dose Chemo tablet. Doesn't sound right to me.
I have no idea what Australian laws might pertain to this case - but it certainly makes sense to have an attorney check to see if the hospital is indeed following the law in this case. It sounds rather fishy to me and like the hospital would relent if advised by an attorney that they could face a lawsuit if they delay the chemo.
In the USA, no covid vaccines are actually 'approved' - they are only 'allowed for emergency use'. Legally, this is a big deal because it's difficult for hospitals/schools/employers to require a non-approved vaccine. Has the Australian govt officially approved any covid vax?
If your Father-in-Law would like to opt for something other than chemo (which I don't believe has a very good track record anyway), he might look into non-hospital therapies like the Beck Protocol which would not involve the patient with institutions mandating a vaccine:
https://www.bobbeck.com/pdfs/beck-protocol-handbook.pdf https://vimeo.com/59047925 https://www.chrisbeatcancer.com/bobbeck/
I have a friend who beat ovarian cancer by this method. The health improvement she experienced over a three-month period was remarkable. Seven years on, she's doing great.
According to our version of the FDA, which is the Therapuetic Goods Administration, has granted it a "Provisional" determination. You can read more here: https://www.tga.gov.au/covid-19-vaccine-provisional-determinations
I'd think that an attorney could convince the hospital that they risk committing medical malpractice should they require a therapy (unrelated to the condition that the patient seeks to treat) for which there is merely a "provisional determination" of safety.
In the U.S. at least, hospitals are often quite bossy and authoritarian when they speak with patients' families on controversial matters, but become skittish and suddenly "flexible" when confronted by a law firm.