The Livingstone is a great starter river. Definitely bring your brother! It's big enough to have some challenging wading (again, for a beginner), but small enough to not really be dangerous (lose youe footing and fall in? Stand up!). Big enough to cast properly, small enough to cast to the whole pool from a good spot.
It's just right for fishing with someone you like (presumably you like your brother) - most good spots can be fished by a couple of people at a time, though (Alberta) fishing etiquette prohibits it if you aren't "with" the other people.
When water conditions are good (they weren't last weekend buy may have cleared up by now), you can see lots of fish: cutthroats sitting where you'd expect them, whitefish hanging near the bottom, and the big bull trout cruising the pools.
Can you tell I like the Livingstone?