An upcoming biography claims Queen Elizabeth's sister, Princess Margaret, had fetal alcohol syndrome due to the Queen Mother's drinking.

Citing the research of Dr. Kenneth Jones, one of the two doctors who identified term fetal alcohol syndrome in 1973, Secrest writes that Margaret "had a poor awareness of physical danger" and struggled with impulse control, as many with the condition can do, and would "blurt out the truth."

A new biography claims that Princess Margaret may have suffered from foetal alcohol syndrome caused by the Queen Mother’s drinking. The syndrome, which results from a baby’s exposure to alcohol in the womb,

A new royal book has made a bombshell claim about Princess Margaret READ MORE: Princess Beatrice makes fans go wild after latest appearance with baby Athena READ MORE: Princess Kate interrupts holiday break to make major announcement Ms Secrest claims that despite Margaret lacking the syndrome's distinct signs of a smooth lip philtrum and small eyes,