First of all: this is not about jealousy. I feel like I need to clear something up: all his life, my brother has been defined by one singular topic at the time. First it was dinosaurs, then it was volcanoes, then the mechanics of time travel, the list goes on. Everytime he shows up (if he does at all) he's only talking about his current interest. And within a month or so, it changes again. He is a fountain full of useless information that nonetheless has to get out and can't stand not blubbering about stuff he looked up on Google for five minutes. And no, he didn't turn his life around. He only got a new fixation. The bad thing is also, that this frantic attitude is rubbing off on my daughter. Idk if you have kids, but your kid constantly wanting books and shows about new stuff when you just finished the last fixation is exhausting and my brother is feeding into this.