For the others who criticize the game for missing elements present in the GBA titles, this is a near port of the original Japan-only Fire Emblem on the NES, with much better graphics. This also means that it's a great game for Fire Emblem beginners, although Fire Emblem for the GBA contains a far more comprehensive tutorial.
As for content, it contains people fighting with weapons like swords, axes and bows, and contains magic that may conflict with religious faith, but there is no blood, and isn't as violent as some other strategy games. Dead units disappear instead of leaving behind a body, and permanent death of characters can be turned off, resulting in the character reappearing later.
Regardless, you may not want your children exposed to this content.