Inarush my dad died in January from a brain tumour (GBM grade IV). He was in Australia, I live in the UK so it was incredibly difficult; luckily the rest of my siblings are in Oz so they were there for him.
I went over twice, the last time was at Christmas 3 weeks before he died. He had gone into the hospice 5 days before I had arrived for pain management and also because he was increasingly unsafe at home. My sibs were having to do a rota system to be with him as he was wandering, didn't sleep well, turned on the oven for example, fell over, was quite confused. It was incredibly hard for them, so going into the hospice was best for them as well as him.
Dad initially said he wanted to die at home, but as he got more ill he realised that wasn't really feasible, especially as he didn't want any of the family to do any personal care for him. And of course near the end he was asleep for 23 hours of the day so needed full nursing care.
He also needed constant tweaking (and increasing) of his pain meds, so being in the hospice was the best place to get that done quickly and appropriately.
It was a lovely place ironically - peaceful, totally patient-focused and with such kind and experienced staff. Dad's death was peaceful, dignified and comfortable, which is all we ever hoped for.
I am so sorry you are going through this - it is the hardest journey, so very painful and difficult. Please CAT me or let me know if you want to chat, if you have any specific questions.
Thinking of you and your dear dad.