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Webster 1913 Edition

Noun.

The state of being a son, or of bearing the relation of a son; filiation.

Dr. H. More.

Noun.

[from son.]

The state of being a son, or of having the relation of a son.

Filiation; the character of a son.

sonship ‎(plural sonships)

The position or state of being a son.
- 2009, Karen Armstrong, The Case for God, Vintage 2010, p. 89:
  Jesus' unusual conception and birth were by no means the chief ways in which the first Christians expressed their sense of his divine sonship.