Lucozade - NOT!!! Lucozade 'Sport' which contains caffeine - has a decent mount of glucose and the thing is generally Stacy whatever you have, it needs to stay in your mouth a little while - since glucose (and sugar but that's slower than gluc itself) starts to be absorbed through the inner cheeks. So Dextrotabs need 'crunching chewing and sucking' to eat them, they therefore stay in the mouth longer than just necking a draught of Lucozade, OJ, 'full fat' Coca Cola or any other drink.
My prob is I can't chew easily at all, and swallowing is also difficult, when I'm hypo - so Dextrotabs just can't do it - unless I'm only about 3.6 or something. Consequently I opt for orange Lucozade, because there's a chance as long as I drink it slow enough, it will get to the sides of my mouth enough and also dribble down my throat easily. Useless when mega low cos I'd just choke to death! LOL
You need to do a test - give Riley a precisely measured 10g carb and test test test - by how much does his BG increase? (eg -10g increases my BG by 2.5 to 3.0) and so calculate what he needs - but the minimum for a kiddie is 15g which errs of the safe side normally. Re-test after 15 minutes. Another 15g if the first hasn't given a decent increase by then, retest again. Don't attempt to correct any resultant high until AT LEAST the next mealtime as long as that's a couple of hours, or the one AFTER, it a meal is imminent. Only have the basic matching amount of insulin for the carbs, don't try to be as clever as some of us old uns do with the benefit of decades of experience and an insulin pump.
You have to even out your 'usual' BG slowly - and it's better - less harmful - to run a BIT high for half a day sometimes, than yo-yo.