I am not claiming to be the son of Czar Nicholas the Second, I am the son of Czar Nicholas the Second! ---- Whoever it was claiming to be from Mars is wrong; Mars is uninhabitable.
Alexis
Czar Nicholas II became ruler of Russia in 1894 after the death of his father, Czar Alexander III. He was the eldest son and heir to the throne, following the tradition of hereditary monarchy in Russia.
Grigory Rasputin
Tsarevich Alexei had hemophelia.
The youngest child of Tsar Nicholas II was his son Alexi
Czar Nicholas II, the last emperor of Russia, was executed by a firing squad in the early morning hours of July 17, 1918. Also executed with Czar Nicholas II were his wife, son (and heir to the throne) four daughters, his personal physician, and four servants.
Nicholas II was the last Czar. There had been a Nicholas I before him. Your question did not specify which Nicholas was being referred to. There is some theory that either Michael Romanov, Nicholas II's brother, or Alexei Romanov, Nicholas II's son, was the actual last Czar but this is non-sense. The theory that Michael was the last Czar is based on the fact that when Nicholas II abdicated the throne, he passed it on to his brother Michael who refused it, was never crowned and never acted as Czar. The then existing Russian Constitution stated that the Czar could not give the crown to anyone he chose, but that it had to go to his eldest son first. The abdication in Michael's favor was therefore illegal and of no effect. Since he was never the Czar he couldn't have been the last one. The theory that Alexei was the last Czar is also based on the fact that the abdication in favor of Michael was illegal. Since the Constitution stated that the crown fell to the Czar's eldest son, the speculation is that when Nicholas II abdicated, the crown automatically fell to Alexei regardless of the abdication in favor of Michael. The problem with this theory is that Alexei was never crowned Czar and never acted as Czar. Again, since he was never the Czar, he could not have been the last one either.
That would be Nicholas II, who abdicated for himself AND his son in 1917. He and his family were killed by the Bolsheviks afterwards.
Had he not been forced to abdicate, his only son Alexei would have become czar eventually. However, Alexei was a hemophilliac, meaning his blood had a hard time clotting. A single pinprick could cause him to bleed out. Had he died before his father and Nicholas had not had another son, the czar eldest daughter Olga would become the Czarina.
In the ancestry sense Tsar Nicholas was the son of a Danish Princess and a Russian Tsar, thought his ancestry was mostly German. He was also British, Scandinavian, Russian etc
There were two czars (or 'tsars,' depending on the system of transliteration) by the name of Nicholas. Nicholas I, whose reign lasted from 1825-1855, was the son of Tsar Pavel (also Romanized as "Paul") I. Nicholas II, the last ruling tsar, who abdicated the throne in favor of the provisional government in 1917, was the son of Tsar Alexander III.