Dont really know who's being unreasonable here.
DPs brother is disabled, and needs help for mobility issues. His wife (DSiL) has arranged for them to go on a cruise holiday for 2022, however due to DBiLs disability, they will need to bring a carer on the holiday with them.
SiL wants the carer to pay for her own spot on the holiday (thousands) and not accompany them on any trips/meals, just essentially do the care in the morning and night, and then leave them alone for the rest of the holiday. She will pay the carer for the hours shes working.
AIBU to think shes being a CF here, and said I would pay for her to attend the holiday, or at least pay her for the 24 hours even if shes not assisting with care.