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Prince Osman Rifat Ibrahim's Homepage is a real source, because he is a direct descendant in paternal line of Mehmed Ali Pasha. Please have a Look, His Ancestors was from the Turkish City İliç, www.mohamedali.eu/mohamed_ali.html
He might be an ancestor but that does not make him a reliable source since he is not given a proof for it. Being an ancestor does not give him a priviliged access per se. Another ancestor, Hassan Aziz Hassan, is believing the opposite. See what he has written in his writing In the House of Muhammad Ali: A Family Album, 1805-1952:
There is a theory among some that makes Muhammad Ali a Turk of quite ancient lineage. This was unheard of during my childhood and I prefer to stick to the tradition that he is of Albanian descent — a theory that is backed up by his own words in 1829 to the French travelers Messieurs de Caldavenes and de Breuvery: "Alexander and Ptolemy were Macedonians and I too am from Macedonia." And the fact that he spoke Albanian is most significant. However, the Turkish theory is not to be completely discarded and, if correct, takes the family back another five hundred years into central Turkey. What we do know is that his father's name was Ibrahim Agha, the son of Osman Agha, who was the son of another Ibrahim Agha.