Did king Midas have sisters

Answer 1

Midas was the son of Cybele and Gordius; no other children of Gordius are known, however, Cybele was strongly identified with the androgyny Agdistis who possessing male and female organs was feared by the other deities. Who then castrated Agdistis; from the blood grew a almond tree, which either produced the boy child Attis by itself or when Nana, daughter of the river-god Sangarius, was gathering the fruit of this tree, she put some almonds (or, in some accounts, a pomegranate) into her bosom; but here the almonds disappeared, and she became pregnant with Attis who was consort and beloved by Cybele/Agdistis.

This would make Midas the brother of Attis as well

Korybas by Iasion (first of the Korybantes)

Sabazios (equivalent to Dionysus)

Would also be sons of Cybele and brothers of Midas.

Of daughters of Cybele I can find only two:

Alke-Kybele (by Olympus)

Nicaea was his sister by Cybele and the river god Sangarius.