Will Grace be the sister Madonna wants for her little African boy?

Despite her publicist's claims that she is not adopting another child, friends claim that the singer is looking for a sister for her adopted Malawian son David Banda.

And they add that she intends to start an entire 'rainbow family' of up to three more adopted children following the example of filmstar Angelina Jolie.

Madonna spotted Grace among a video collection of 11 candidates for adoption put together by an orphanage in Malawi and couriered to her London home in November.

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After seeing Grace (right) on film, Madonna asked for a longer look before heading to Africa. (Left) The superstar with adopted son David

She asked for another 15-minute film to be made of the child, who has no relatives and has been at the orphanage since she was three months old.

This week Madonna, David and her daughter Lourdes visited Grace's orphanage and met her face to face.

"At first all 11 from the original video were there," said a source.

"Then all the other children went out and there was just Grace there. Madonna was chatting with her and David was playing with Madonna's sunglasses. They were together for about 15 minutes. Madonna looked very happy with Grace."

Despite the success of the meeting, the singer is understood to be still considering two other girls from the same orphanage. Which one she finally chooses will depend on the outcome of medical tests for diseases such as Aids.

"Grace is not necessarily the one - though she is certainly a favourite," said the source. "Madonna is looking at other children and Grace will probably not be coming home with her this trip."

Andrina Mchiela, of the Malawian government, said recently that it was unaware of any move by Madonna to take on a second child.

And this week her publicist Liz Rozenburg said the 48-year-old star was simply in Malawi to oversee the building of a children's health-care centre.

In the past few days, however, Madonna has been taking advice from Angelina Jolie and Brad Pitt - who are friends of her husband Guy Ritchie from his film work.

Ritchie jetted out to Malawi last night after weeks of furious arguments between the couple over the prospect of them adopting further children.

As the Mail revealed earlier this week, they have been at loggerheads over the issue of how the adoption of baby David was handled.

It was against that background that 38-year-old Ritchie refused to fly out to the impoverished southern African country this week, telling his wife he had prior commitments.

A friend said: "Madonna was furious, telling him to reschedule, saying she and the family came first. But Guy would not budge."

That apparently all changed yesterday when Madonna phoned her husband in London giving him an ultimatum.

"She said to him, if you don't get out here, then that's it," said the friend.

"Madonna is a feisty character - that is not particularly a revelation. But Guy must have felt sufficiently rattled by what she said to get on the plane.

"He probably felt she was fighting the battle on her own and that he should, as her husband, be at her side. Guy got the feeling that his decision not to go was going to have serious consequences for their relationship."

Helping to swing his decision was the fact that Madonna has arranged a meeting with Nelson Mandela after persuading him to back her plans to 'save' Malawi through the word of the kabbalah, a religion based on Jewish mysticism.