The International Equestrian Federation (FEI) is investigating a second member of its president’s family for alleged horse doping.

The governing body said Friday that Princess Haya of Jordan will step aside from her presidential duties when it considers the case against Sheikh Hamdan bin Mohammed Al Maktoum, the son of her husband, Sheikh Mohammed bin Rashid al Maktoum.

Sheikh Hamdan rode his horse Eo Fawati in a 74 1/2-mile endurance race at Bahrain in January. The horse tested positive for metabolites of the anabolic steroid stanozolol.

Sheikh Mohammed, the ruler of Dubai, rode his horse, Tahhan, when it tested positive for stanozolol metabolites in Bahrain. It also had traces of the banned substance guanabenz in Bahrain and after racing in Dubai in February