Throwaway account , sorry for all the run on sentences and commas everywhere TLDR at the bottom

fBit of a backstory, my bil has not lived with my inlaws for close to 20 years and only comes into town a few times a year to do personal things under the guise of "visiting" my inlaws. My fil had a stroke in 2022 , was near death and managed to pull through with lifelong complications, double amputee, memory loss, dementia, etc. He is not the person he used to be, often saying outlandish things, seeing things that arent actually there and what not The issue comes from the fact that since my fil had his stroke my wife and I are the only ones who help my mil care for him. We have asked him to come help every once in a while since he lives an hour away . His excuse is that he's far too busy with work, even though he's constantly taking vacations and trips. When he does "visit" he riles up my fil promising him things that are not actually going to happen , for example he promised him to take him to buy a llama because my fil said he wanted a a farm. After he left my fil kept insisting we were keeping from from buying a llama and bil had already promised him it was going to happen. WHO TF IS GOING TO TAKE CARE OF A DAMN LLAMA? He has also told him he was going to get him a bicycle. A double leg amputee riding a bicycle He does this constantly he comes over for other personal things and just riles up my fil without ever actually helping to take care of him. I on the other hand am constantly taking him to Dr's appointments , spending time with him , giving my mil a break by taking him out of the house for a whiile. My wife does the same , we miss work sometimes to help them and we see them every day. Now last week bil showed up to the house to "visit" he really just wanted to go do something else . He asked mil for access to the cameras in the house as well as the doorbell cameras because " he wants to know shes ok if she doesnt answer the phone". Cameras that we bought to keep an eye on them should anything happen if we are not there. ( we live around the block 2 min away and have been very helpfuil when my fil has fallen off the bed and we rush over to help ) Since this whole ordeal started with my fil i have been very protective of my inlaws. I know theyre not MY parents but I do treat them as if they were. Theyre in their 70s with their only support coming from my wife and I .I dont feel comfortable giving him access to cameras he didnt buy to keep tabs on my inlaws who he doesnt bother to actually visit or make any effort to help with. There have been times when he comes over and my inlaws and us are out of the house, and I have seen him snooping around my mil's bedroom. He has in the past taken out credit cards in my fil name since they share the same name. I just have a bad feeling about why he really wants access to the cameras. AITAH?

TLDR; BIL wants access to inlaws secruity cameras and I dont want to give it to him because I feel he is up to no good.