Well - if you ever had a glass of dry white wine and remember what it tasted like ... imagine that with a teaspoon of sugar added to it. Sherry is sweeter than straight wine - it also has fruit, nut and floral notes that wine doesn't. And, sherry has a higher alcohol content than wine.
You might look for something called Verjus - it is unfermented white grape "wine". It is a good wine substitute for those who are sensative to alcohol but want some wine flavor.
Another option would be non-alcoholic or de-alcoholized wine. They take wine and remove as much alcohol as they can - it's really only good for cooking. But, it still has a trace of alcohol - about 0.5% (one half of 1 percent).
Maybe this will help with alcohol content:
Verjus - 0%
Non-alcoholic/de-alcoholized wine - <= 0.5%
Wine - 12%
Sherry - 18%-24%
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain