As a child I would eat anything. So would my brother. My parents had an easy time of it, but their siblings, who cooked very similar food and seemed to take a similar approach to childrearing, each had a child who was a very fussy eater indeed. This was in the 60s, so this is not a new phenomenon!
When he was little my son had a very restricted range of foods he'd eat (just as my husband had, when he was little - he grew out of it too). It wasn't done for attention or mischief, he genuinely struggled with the taste, the texture or just the strangeness of many, many foods. His older sister, given the same stuff, would eat it all with pleasure.
I did worry about it, but forced myself to think about the nutritional value of what he did eat, and actually it was fine. I would have been happier to see him eating a greater variety, but he was extremely healthy, active and slim, as he still is, so really, in the end, what would have been gained by making all of us miserable by constant rows none of us could win?
Fast forward to 2015 - he is now 21 and eats just about anything. He cooked calamari for our Mother's Day dinner, having told us it was now one of his favourite things!
I just don't see the point in making a huge fuss about food. I could always put a meal together for him quickly and without it really interfering with our meal, which was usually different.