The lapband isn't 'magic'. It works because you physically cannot eat as much without being in chronic pain and violently sick.
If you look at the 'diet' for the first month after the surgery you will see that you will eat very little, mainly liquid food.
Forever afterwards the diet is extremely limited and can not fit easily with 'normal' family life. No Christmas dinners or special meals out. Even a burger at McDonalds would be difficult. This is NOT a good example to set to younger family members, even if you are prepared to forego a major part of social family life.
Many who have had this surgery get so frustrated with the diet they eventually cheat. Some put on more weight than they lost.
If you do stict rigidly to the diet you could lose weight too quickly. Unless you have very good skin tone, you could become baggy and saggy, with excess loose skin hanging from your face, upper arms, thighs and stomach especially. You will then want surgery to remove this.
If you are still convinced that you have the willpower, determination and strength of mind to undergo this operation you should be strong enough to follow the boring but far safer route of a healthy diet and more exercise. At least you will be able to eat normally and not be risking your life. As the weight will be lost more slowly your skin will recover much better.
The money you save by not having this operation can be better spent on a new wardrobe for you and a holiday for you and your family.
If you start a sensible diet and exercise plan now you can realistically expect to lose 2lbs a week. Half a stone a month. By Christmas you will have lost nearly all the weight you feel you need to, but you will start feeling better in just a few weeks.