Cleopatra was born in 69 BC in Alexandria, Egypt. In the springtime of 51 BC, Pharaoh Ptolemy Auletes died and left his kingdom in his will to his eighteen year old daughter, Cleopatra, and her 12 year old brother Ptolemy XIII. (since the Pharaoh was usually male.)

Cleopatra was born in 69 BC in Alexandria, Egypt.

Cleopatra VIIs, Father was Ptolemy XI Auletes, king of Egypt.
Cleopatra VII's mother would be Cleopatra V Tryphaena, who either died or disappeared in 68 B.C., right after Cleopatra VII's birth in 69 B.C.

Older sister, Cleopatra VI Cleopatra VI may have died as a Child.
Cleopatra VI disappeared in the intervening time between 58 and 55 B.C.
Older sister, Berenice IV Auletes had Berenice beheaded.

Younger sister, Arsinoe IV.
Younger brother Ptolemy XIII
Younger brother Ptolemy XIV.

There was anarchy abroad and famine at home. Cleopatra was a strong willed, was brilliant and dreamed of a greater world empire.
Her father knew she had the right stuff, but the Pharaoh had to be a male so made arangements to have her marry her younger brother for this reasion.