Researchers came to the conclusion that having two daughters is the key to a happy and harmonious family life after examining the lives of families with different combinations of children, both male and female.
The results show of all the variations, two girls make for the most harmonious family life as they are unlikely to fight, will play nicely and are generally a pleasure to be around.
By contrast, doubling the number of daughters is likely to lead to a whole world of pain, the report found.
Mums and dads with four girls turned out to be the least happy with family life overall, with one in four of those admitting they were not 100 per cent happy with their lot - and one in three finding it hard to cope on a daily basis.
But parents of four girls ranked them at the lower end of the spectrum in most sectors due in no small measure to the sheer workload managing four youngsters who regularly squabble and know how to wind each other up.
In fact, mums and dads with four children of any gender found it harder, the results showed.
Other difficult combinations of children include two boys and two girls, three girls and one boy, and three boys and one girl - although 62 per cent of parents with this combination would have exactly the same number of children if they had their time again.
''Every child is a blessing and there are lots of things parents can do to ensure family life is as harmonious as possible.
"Making sure quality time is spent with all children, reminding them how lucky they are to have siblings and creating family rituals such as eating and playing together can all help everyone to get the most out of family life together.''