Interesting thread this. My sons are now 19-25, two have left and the youngest virtually has. As children we encouraged them to experiment through offering them a wide range of foods cooked in a variety of styles, like most kids some things were rejected but we never pandered to their tastes though I know both my wife and I would take the easy option on occasions. Kids can be picky no doubt about that but our attitude was always, and still is, "there's your tea or teas's ready."
My middle son, who will be 22 this year, has Downs Syndrome and has survived nearly 20 years on an extremely limited diet of toast, bread rolls, Weetabix and milk. Very occassionally he would try something else but this was rare, I think it must be 20 years since he ate fruit or vegetables. Since leaving home his diet has improved and this I think is largely due to seeing what his peers eat at college and in his shared house. As the doctor pointed out once, half the world live on a worse diet. Tom is a thriving young man.
One of our favourite family dishes grew out of trying to get the kids to eat. Their harrassed mother when asked what was for tea replied "....and potatoes" to a round of groans and potatoes are boring. Next question was what sort of potatoes, to which she roared the reply "Interesting ones!"
The recipe for interesting potatoes is simple chop potatoes into 1" cubes, chop any suitable veg you can find, place in large bowl, add ground salt and pepper, loads of crushed garlic, lashings of olive oil, toss to cover veg with oil. tip out on to a baking tray. Place in gas mark 5 till potatoes are soft inside and crispy out. Quick, easy and interesting.