Madonna has left Malawi without letting the father of her adopted son see his only child, it has been claimed. Farmer Yohane Banda is said to be distraught after two meetings for him to be reunited with 18-month-old David were cancelled.The singer visited the African country last week with baby David and daughter Lourdes, where she spent time working on projects for her charity,Raising Malawi. Although the trio went to the Home of Hope orphanage, where Madonna first met David last year, the much-publicised father and son reunion failed to materialise. A source told People magazine: "Yohane was there all day on Saturday and in the morning of her visit."He was told he would spend some time with his son but the meeting was cancelled."Madonna's representative, Liz Rosenberg, said she did not know whether the reunion took place. During the trip, it was revealed Madonna had met the three-year-old Malawian girl she reportedly wants to adopt. Despite her publicist denying she is to adopt again, Madonna reportedly told friends she is looking for a sister for David and is considering welcoming orphan Grace into her family. A source said: "Madonna was talking with Grace and looked very happy. They were together for about 15 minutes."