Is my nephews diet wrong?

My sister had a little boy about 2 years ago & decided that he would be vegetarian – which is fine, I can live with that. What has actually happened is that shes blocked all meat & fish out of his diet.....and I don’t think he would know a vegetable if it hit him in the face. All I see is that he eats cheese & chips, cheese sandwich, block of cheese, Egg sandwich, vegetarian burgers....but the diet is mainly chips.
If he does have a vegetarian meal, it’s a bought one from the supermarket.
What now happens is taht when we go out, hes given cheese (again) on toast & he refuses to eat it. My sister cant see that if I was given sausages none stop, Id probably refuse them after so long.
Is this diet “wrong” as in unhealthy? Or am I just being over worried? My sister & her husband are both meat eaters & I just cant help but think of the consequences of this situation later on in life.

[gymdandee]

From what you stated it's completely wrong! that's not a vegetarian diet.

[allmymarbles]

Very classy for her to call it a vegetarian diet. Actually it is a junk food diet. Who ever heard of a vegetarian diet that omitted fruit and vegetables! What you have is a very lazy sister. And she is going to have one unhealthy child.