HOUSTON (AP) — Former President George H.W. Bush remains in a Houston hospital and received a visit from his son, former President George W. Bush. A photograph was posted on the elder Bush’s Twitter account Thursday, showing him and his son smiling. Family spokesman Jim McGrath reports no changes for the 92-year-old Bush who spent another day under observation after recovering from a mild case of pneumonia. He will remain in the hospital over the weekend while he recovers.