The diagnosis of a patient presenting with familial Polyostosis, Precocious puberty and Pigmentation is
McCune Albright syndrome :

A polyostotic form of fibrous dysplasia
Cutaneous pigmentation
Endocrine dysfunction, especially Precocious puberty in girls.
The triad of symptoms in the question thus characterizes McCune Albright syndrome and hence is the answer.
Tuberous sclerosis
McCune Albright syndrome
Klinefelter syndrome
SLE