Seqenenre Tao
Seqenenre Tao (also Seqenera Djehuty-aa or Sekenenra Taa), called 'the Brave', ruled over the last of the local kingdoms of the Theban region of Egypt in the Seventeenth Dynasty during the Second Intermediate Period.
He probably was the son and successor to Senakhtenre Ahmose and Queen Tetisheri.
The dates of his reign are uncertain, but he may have risen to power in the decade ending in 1560 BC or in 1558 BC (based on the probable accession date of his son,
Ahmose I, the first ruler of the eighteenth dynasty, see Egyptian chronology).
With his queen, Ahhotep I, Seqenenre Tao fathered two pharaohs, Kamose, his immediate successor who was the last pharaoh of the seventeenth dynasty, and Ahmose I who, following a regency by his mother, was the first pharaoh of the eighteenth.
Seqenenre Tao is credited with starting the opening moves in a war of revanchism against Hyksos incursions into Egypt, which saw the country completely liberated during the reign of his son Ahmose I.
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Ahmose-Meritamon (17th dynasty)
Ahmose-Meritamon (“Born of the Moon, Beloved of Amun”) was a princess of the 17th Dynasty of Egypt, probably a daughter of pharaoh Seqenenre Tao (the Brave).
She is also called Ahmose-Meritamun, Ahmose-Meryetamun or just Meryetamun.
Her mummy was found in the Deir el-Bahri cache (DB320) and is now in the Egyptian Museum in Cairo.
The shroud covering her body gives her name and titles as "the royal daughter, the royal sister Meritamon".
Gaston Maspero had doubts about the identity of the mummy, but Grafton Elliot Smith points out in his description of the royal mummies that the method of mummification is consistent with that of the 18th Dynasty.
The remains are those of an old woman who was relatively short in stature.
The examination of her mummy shows that she suffered a head wound prior to her death which has the characteristics of wound sustained when falling backwards.
The body was badly damaged by tomb robbers.
She is not to be confused with her niece Ahmose-Meritamon, who became the wife of Amenhotep I.

Question: Who is Ahmose-Meritamon (17Th Dynasty)'s paternal grandfather?
Answer: Senakhtenre Ahmose