How many children did Tsar Nicholas 2nd have?

He had five children.

Four were female: Tatiana, Olga, Maria, Anastascia.

One was male: Alexei (he had haemophilia, however this was mysteriously cured - believed to be the work of the ill-reputable Rasputin)
Olga Nikolaievna Romanov

Tatiana Nikolaievna Romanov

Marie Nikolaievna Romanov

Anastasia Nikolaievna Romanov

Alexei Nikolaevitch Romanov