Five judges at the Supreme Court gave a unanimous decision in the case of Shamima Begum, whose legal battles have come to be seen as a test of how Britain treat nationals who joined jihadists.
The UK says the new visa could attract more than 300,000 people and their dependents.
Many say China’s encroachment on their way of life and civil liberties has become unbearable, and they want to seek a better future for their children abroad.
China says the path to UK citizenship for its citizens is a violation of international law and interferes with its internal affairs.
Expensive healthcare and visa-related challenges are just some of the problems that await if citizenship is never granted.
Family Frontiers criticises tedious application process and prolonged periods of limited access to education, healthcare and social protections.
They speak of bureaucratic dead ends and concerns for their children's future.
Lawyers for Liberty urges the government to amend the constitution to substitute the word 'father' for 'parent' in order to resolve the issue.
Automatic citizenship to children born abroad to Malaysian women violates the constitutional guarantee of gender equality, say activists.