[1] Have you followed David's advice on going Cold Turkey? For example have you removed everything tempting from the house?
[2] You will know that your appetite-control system is working when before you have finished your meal you have that feeling of satiety "just can't eat another mouthful".
[3] Try making a one or two week inventory of ALL your fructose intake. If necessary weigh you portions and calculate the amount of fructose. Keep it to under 1 gram per day. Especially look for sugar hidden in processed foods. As a rough guide half of the percentage of "sugars" may be regarded as fructose. Avoid anything with more than 2% "sugars" [5% for yoghurt].
[4] When you crave something sweet [whatever euphemism you use for that] try distracting yourself by moving away, checking your email, walking around the block - anything to change your focus for a few minutes. If it's anything like quitting smoking, and I suspect it's a lot like it, the craving only lasts less than 5 minutes.
[5] When you are experiencing craving try to identify the feeling, emotion, pictures, sounds etc associated with the desire to eat something sweet. Bringing these into awareness and just deciding to let go of them is often enough to dissolve the urge.
[6] Don't expect anyone else to have any magic solutions. YOU have to do it FOR yourself.
[7] If you are answering all these questions "correctly" it is possible that you have a genetic disposition to obesity [ see Fat Chance by Robert Lustig, or your gut flora may be out of kilter [ see The Diet Myth by Tim proctor.
[8] Above all, DON'T give up . . the effort is VERY worthwhile :-) It's working for your family so it must work for you!
JohnN