So sorry to hear about your father-in-law passing away, Goth.
Interesting experience with the brown apparition... your experience reminds me in some ways of when my grandmother died, about 10 years ago. When she was in the hospital, there were a couple of incidents that seemed as though she and I were communicating telepathically - this had not happened to me before that I'm aware of. And at one point late at night I suddenly became aware (she was too ill to speak) that she wanted my sister and I to leave the room because she wanted to save us from the experience of seeing her pass away. I told my mum and she agreed that I was right; she stayed with my grandma while we went downstairs in the hospital. And while we waited downstairs, there came a moment where I knew she had passed away. Not long after that, my mum came down out of the elevator and told us the news. I had a lot of dreams about her after that which I know for a fact were real experiences. The feeling of knowing that someone has died before you actually hear about it is a weird one - it's very subtle, but you just know.