You should eat more of low fat, high fiber foods. Fat has twice as many calories as carbohydrates or proteins. Wheat bread has more fiber. It does if it's whole wheat bread. Make sure that whole wheat is high on the ingredient list.
Some breads are actually just white bread with caramel coloring.
Overweight is inherited. You may inherit a predisposition towards being overweight which will make you more vulnerable to obesity but still does not make it inevitable. Overweight is still determined by your lifestyle, not your genes. You have to eat more calories than you burn off to gain weight. You don't inherit obesity the same way as you do physical characteristics, such as eye color and hair color.