DEAR AMY: My brother and I have always had a tenuous relationship. Our father was abusive, but we are both in mid-life and have led fairly successful and stable lives. I often have to walk on eggshells when speaking with my brother because he always seems to read what I’m saying or doing as an attack. Last New Year’s Eve, I was attending a get-together with friends and he called to video chat. I sent a quick text saying that I was with friends and that we’d talk later. He texted, saying that he was disappointed because he had told his kids they could talk with their uncle (me), and that I seem…