I am surprised by what you say rest of my family ..did not want slimming world customised food. I have never belonged to Slimming World but I buy the magazine and I find the recipes the magazine includes entirely mainstream. They do 'healthy' versions of family favourites like currys, pasta dishes etc and use mainstream ingredients and I regularly cut out and use their recipes, even though I am not following, any weight loss programme. I do not think anyone in the family is aware that any particular recipe I use is from a slimming magazine because the recipes are just like all the other meals I prepare for the family.
I wonder whether your problem is, in fact, your families ordinary eating pattern. Is it high in fat, sugar and carbohydrate? What sort of meals are you eating and how big are the portions? This is not good for any of you and perhaps you need to start re-educating the eating patterns of all your family.
Sadly, it is a myth that exercise alone can reduce your weight. There have been a number of articles in the press in the last week reporting research into this. Regular exercise has many other health advantages, but weight loss, without a healthy balanced diet, is not one of them.
I would also ask whether you are now around the age of the menopause because a lot of women (including me) find that they start putting on weight in their mid-late 40s onwards and find it very hard to lose, even though the have had no problem before.
By the way, Slimming World now do a range of ready meals, sold through Iceland, would that help if you returned to their system?