PIL live in a house with an upstairs bathroom, no downstairs facilities. MIL can barely walk and FIL is carrying her up and down stairs. FIL is not in the best of health himself. They are refusing a stair lift and other adaptations to the house. DH and his siblings are at the end of their tether with them. They were difficult people when in good health - stubborn, their way or the highway type of people - and are just digging their heels in now and refusing any help. We think MIL is suffering depression. FIL has started going to the GP complaining of health issues that are affecting MIL not himself (he's saying that they are happening to him) but MIL won't go to the GP herself and apparently the GP won't do house visits now.
They've started locking themselves in the house and leaving the keys in the locks so that, even if we did have spare keys, we wouldn't be able to unlock the doors anyway. They do this because they're fed up of people (family) just calling in (always had an open door up til now). Obviously we're worried that there's going to be a fall or health issue.
Does anyone have any advice on who we could contact in this situation? Could DH as eldest child be given POA or similar so that he has the power to fit a stair lift and other adaptations?
Any advice would be gratefully received. Thanks