Fruit and chocolate.
If your family need a sweet after eating, cut an apple, banana, pear, melon , strawberries, in fact any fruit that you have into bit sized pieces.
Melt about 6 squares of chocolate with a drop of skimmed milk in the microwave or bain Marie.
Then everyone can sit and dip the pieces of fruit in the chocolate, of course do a quick dip in and out, that way the ratio will be more fruit less choc.
You will not feel deprived in anyway, and it is a healthy desert for the family even if they don't need to lose weight, and really yummy.....