One in 25 men may be raising another's child

A study claims 4% of families may be affected by parental discrepancy.

Researchers at Liverpool John Moores University wrote in the Journal of Epidemiology and Community Health that they have uncovered hidden aspects of sexual behaviour that may have far-reaching social implications.

The increased use of DNA profiling and genetic testing have made it easier to determine a child's paternity and make it likely more men will find they are not the father of their children.

Study results have suggested rates of discrepancy ranging from one percent to 30 per cent but experts have generally agreed the rate is below ten per cent and a rate of four percent would mean one in 25 families is affected.

The researchers said: "For any father, identifying that the child they are raising as their biological progeny is actually sired by another man can have substantial health consequences.

"Such knowledge can also destroy families, affecting the health of the child and mother as well as that of any man who is ultimately identified as the biological parent."

People who conceive at a younger age, live in deprived areas and are in long-term relationships rather than marriages are at higher risk of paternal discrepancy.