Williams offer tests to champions' sons

Nelson Piquet and Nico Rosberg have been given a second Formula One test by Williams.

Rosberg is the son of Keke who became the first Finn to win the world title with Williams in 1982.

Piquet's father, also called Nelson, won the championship three times.

The duo will help the BMW-powered team in their pre-season preparations.

Rosberg will test at Barcelona's Circuit de Catalunya next week while Piquet will be at the Spanish track in the first week of February.

They will use modified versions of last year's car.