Go with whole grain instead of white breads.  Make your family's sandwiches with whole grain bread rather than white. Look at the ingredients to make sure there's at least 2 grams of fiber per serving and that whole wheat (or other whole grain like spelt or barley) is the first ingredient. For the pickier kids' sandwiches, try whole grain varieties with white bread-like texture, or use whole grain pita bread or bagels.