What a mess

So I have been in reunion for just shy of a year, I am a full bsib in reunion with my adoptee bro. Upon our first F2F it was very natural and felt like I was meeting with an old friend. Second F2F was in a very social atmosphere and we had no time alone and I felt like he was very guarded, and what used to feel natural does'nt anymore. I see others reunions and they look so happy in their photos, and here I am in my miserable reunion, too scared to ask for a picture together. He barely has contact with me, I send a message "how are you, thinking of you" and sometimes I get one back, but mostly not. I feel like I shoud'nt contact him unless he contacts me, and then when he does, I'm almost angry because he rarely responds to me, why should I respond to him? But I'm not trying to get even or prove anything, so I always respond as soon as I can. My dillema is this: our father has passed, and I had to tell him this upon our first meeting. He died from liver failure, and at the time I thought it was liver cancer because that is what our father's sister told me. I never really knew my dad so I took her word for it. Then I was talking to my fathers brother, and he said my dad died of liver failure due to years of drug abuse and addiction. I really think my brother should know this. I don't want him walking around his whole life looking over his shoulder for cancer. But how do I tell him, if he does'nt even communicate with me? On top of that, our mother, who he has still not yet met, had brain surgery 4 years ago on a brain anyurism. During the surgery they found a second anyurism that is inopperable. Everyday I live with the fear that I may call my mother and her not answer, and I will go over and find her dead. I want to tell him these things, but I don't want it to seem like I am pushing him to meet our mother, and I feel like I have laid some heavy stuff on him, and I don't want to always be the bearer of bad news and constantly be putting crap on his plate that he can't handle. Our first F2F was such a happy occation for me and he told me he would be coming around and could'nt wait to get together again. I gave him pictures our our dad, and I never made copies. I thought I would see him all the time and have a chance to get them back, make copies and give him the origenals back. Now I am thinking I may never see him again, and even if I do, how can I ask for the pictures back? I never really knew our father either, and even though I loath the man, I feel like I lost some photos that I may want to look at later in life. Geeze, what a mess. I feel like I don't have the right to intrude on his life, ask for pictures back, give him all this messed up medical info, and mess the reunion up more than it already is. I feel like he wants me to stay away, so I do. I was very open to establishing a relationship with my brother, I had no choice not to have him in my life and all I wanted was to finally know the brother I lost, but he is so guarded and distant from me, it has made me this way now too.