Respite care for relative with cancer, caring for partner with Parkinsons

Hi,

I'm not sure if this is the right place to post, but given that brain cancer is one form of cancer that she is suffering from, I thought I'd start here.

My mother-in-law is receiving palliative care for various forms of cancer at present.  Given her prognosis, she's hoping to do a little bit of travelling over the next month or so with family whilst she's still physically able to do so.  The issue she has is that she is also primary care provider for my father-in-law, who has recently been diagnosed with Parkinsons.  They have carers coming in several times a day to help him, but he's pretty much house-bound, and isn't able to move from his chair / bed, etc, without assistance.  In short, he needs somebody there with him most of the day.

With a view to myself, my wife, and our kids, taking her away for ~2 or 3 nights, we're exploring the possibility of respite care for my father-in-law for the duration of the trip.  With this in mind, I'm wondering whether anybody is aware of any support available in this situation?  I get that it's an unusual one, but we'd ideally have the rest of us with her for the trip, otherwise I would volunteer to stay behind.  Practically, I'd need to be driver / look after the children whilst my wife and her mum spent time doing some activities together.

Any ideas / suggestions much appreciated!