1.     It doesn’t matter if he is older or younger than your mother. Suppose there are 5 brothers/sisters in a family: A: a lady - the oldest B: a gentleman - the second oldest C: a lady – the third oldest, and your mother D: a gentleman – the fourth oldest E: a gentleman - the youngest Then you should call A “大姨”（the oldest aunt）,call B “大舅”（the oldest uncle）,call D“二舅”（the second oldest uncle）,and call E“三舅”（the third oldest uncle）. Basically the point is, in Chinese we don’t care someone is relatively younger or older than your mother, but we care about the absolute order of their birthday. 2.     Yes, “去世” is much more polite than “死”； 3.     Yes, “计算机” is computer, and “计算器” is calculator. And we actually use “电脑” more commonly. “计算机” means computing machine, and “电脑” means electronic brain, they means the same but “计算机” is a more scientific way to say it. 4.     “竞争” means competition, can be used not just in business.