Wheat intolerance is a possibility but there are no blood tests to prove this.
What must be definitely excluded is gluten
intolerance or coeliac
disease in both your husband and daughter. Coeliac disease is due to an intense immunological reaction to ingested glutens and gliadins in wheat, barley, oats and rye that can be diagnosed using a blood test (IgA-TTG or antiendomysial antibody). Duodenal biopsy
is also done if blood tests do not confirm and the suspicion is high. However, one must be on a normal wheat diet for the tests to pick up this condition.