Russian authorities have annulled the nuptial of a couple who were recently married in a town in Moscow after authorities discovered the groom was actually the grandson of the bride.

Failing to check on their background, registry office officials allowed Boris Golovska, 30, to marry his 79-year-old grandmother Katarina in the town of Vladimir, east of Moscow.

Although the couple's marriage has now been annulled, local prosecutors say they are still investigating the case.