Sources and references for: My husband and one of my daughters are getting fatter

Question:

I have two daughters: Maria who is 12 and Joanna who is 14. Both Joanna and my husband eat far too much and have become fat, but this has never been a problem for Maria or myself.

As I look after the food supply in our home, I am always getting extra work and, e.g, can never make cakes available in case we have guests. After meals those two raid the refrigerator and the bread bin and make sandwich after sandwich. I often find toffee and chocolate wrappings in Joanna's pockets when she comes home from school. Sometimes they do try to slim, but the attempt only lasts about half a day. I provide everybody with low-fat nutritious food, but nothing helps.

Sources, references:

1. The personal experience of Gunborg Palme, certified psychologist and certified psychotherapist, teacher and tutor in psychotherapy.