We have an 8 and 2.5; yes 2.5 almost did not happen - hitting the age wall there, finances, etc! but, it seemed like we should give it a shot. Despite the age gap, they get along nicely, fight in the back seat of the car together, and so on. Ds8 is gt but dd2.5 seems crazy-gt so she keeps up with him pretty darn well! There are pros and cons to all size families to be sure smile