Do you mean for the carers or the person being cared for?
I do appreciate any predicament you have as carers as my wife was a carer for over 5 years with a member of our own family.
I do not know the answer to your query about respite homes etc but are you members of your local British Legion perhaps? Each branch has a fantastic welfare department and may well be able to help or guide you on your way.
I am member of the British Legion and we have been trying to acquire a home of sorts for years here in Spain. It is an uphill strugle but with any luck this matter will be remedied in the near future.
Have you tried your local Spanish Saocial Services?
I wish you well and hope you keep fit and well and carry on being the good carers that you obviously are.