Op, it's irrelevant how other people cope, because we're all unique in how we grieve. Losing someone you love, at any age, is hard.
Personally I'd like to my kids to be at least 18 before I pop my clogs, because before then, as a child, you don't have much autonomy, and if the surviving parent marries again, I think that must be incredibly difficult for a child, no matter how lovely the potential new step-parent. (Hard at 18+, but at least heading towards independence).
My mum died a couple of years ago, I still miss her. She was a wonderful woman, my best friend, my guide and my guru. But I'm also incredibly grateful that I had her in my life for so many years, she died too soon, but when I look at some of my friends and see the painful relationship they have with their parent, I'm reminded how incredibly lucky I was to have had my mum.
If I could give any advice, I'd say ask any questions you might have. I wish I had asked my mum more about her family, I wish we'd talked more about death (I had no idea what she wanted for her funeral), I have so many things I wish I'd asked her, but her death was unexpected and very sudden, no time to prepare, (big stroke which left her very disabled, robbed her of all communication, and she died three weeks later).