The couple, in their 50s and foster carers for seven years, said they had encouraged the children - who are European migrants - to speak their own language and sing folk songs.

BBC: Rotherham foster couple want council apology

Elena Piskunova likes to sing melancholic Russian folk songs in traffic jams - she claims it's the best way to relax muscles and relieve stress.

BBC: What Muscovites get up to in traffic jams