When she needs a lift or money to buy clothes, a girl will turn the charm on her father.
But it seems that a daughter's influence on her dad goes far beyond the odd favour.
Research has found that the more girls a man has, the more likely he is to be Left-wing.
Daughters have such a profound effect on their fathers that they can switch their political viewpoint, a study suggests.
Compared to men, women are more likely to favour Labour or Liberal policies such as higher taxes to fund provisions like the NHS.
They also tend to earn less than men so won't be as hard-hit by higher taxation.
As a man fathers more daughters, he will gradually be won round by their more Left-wing viewpoints.
The study, carried out by Professor Andrew Oswald from Warwick University and Dr Nattavudh Powdthavee from York University, also found that a predominance of sons can make a mother more right-wing.
The researchers even suggested that well-known Left-wing politicians and personalities owed their beliefs to the high numbers of daughters in the family.