Tue December 10, 2013

(CNN) -- The Rev. Billy Graham's son is requesting prayers for his ailing father.

Franklin Graham said that his father, who turned 95 in November, is extremely weak, but his vitals are good.

"Our family would appreciate your prayers for him that the Lord would strengthen him," the son wrote in a prayer request posted Tuesday on the website of the Billy Graham Evangelistic Association.

"Only the Lord knows what is in store as we move forward in service to Him," he said.

The elder Graham returned home late last month, two days after he was admitted to a hospital for pulmonary-related tests and observation. He was admitted to the hospital in October for similar tests.