The Duke of Edinburgh is "getting much better" and is "in very good spirits", members of the Royal Family said.
Royals answered questions about Prince Philip as they chatted to well-wishers after leaving a Christmas Day church service on the Queen's estate at Sandringham, Norfolk.
The Prince of Wales described Philip as "resilient" and "very determined".
The Queen and members of the Royal Family attended the service as the Duke of Edinburgh recuperated in hospital following surgery.
The Duchess of Cambridge joined royals at the service for the first time.
Philip, 90, is being treated at Papworth Hospital near Huntingdon, Cambridgeshire, following treatment for a blocked coronary artery.
Police estimated 3,000 well-wishers had gathered outside St Mary Magdalene Church to see royals, including the Prince of Wales and the Duchess of Cornwall, the Duke of Cambridge, Prince Harry, the Princess Royal, the Duke of York, and the Earl and Countess of Wessex, arrive.
England rugby player Mike Tindall and the Queen's granddaughter Zara Phillips, who married in the summer, also attended the service.
The royals traditionally gather at Sandringham for Christmas. Philip normally walks the few hundred yards from the main house to the church and is not thought to have missed a Christmas Day service before.
Prayers were said for Philip during the service, which was broadcast to crowds outside the church. Sandringham rector the Rev Jonathan Riviere told the congregation: "We pray for the Queen and the Royal Family. Especially today we pray for Prince Philip and his continued recovery."
