Which father and son have both captained in Test cricket?

Zimbabwe's Alistair Campbell and Johnathan Campbell have become the fourth father-son duo to captain in Tests. Alistair led Zimbabwe in 21 Tests, while his son is leading in his debut Test. England's Colin Cowdrey-Chris Cowdrey, India's Iftikhar Ali Khan Pataudi-Mansur Ali Khan Pataudi, and England's Frank Mann-George Mann are the other three father-son duos to have achieved the feat.