United Kingdom - Passport & Nationality - British Citizenship by Descent (UKM2010 pre 1983)
The requirements for you to become British by Descent under these conditions are as follows:
> The candidate must have been born BEFORE 01.01.1983; AND
> The candidate can be born anywhere in the world (in other words, the birth did not have to occur in the United Kingdom); AND
> The mother of the candidate was born in the United Kingdom.
If you have spent (or can spend in the future) at least 2.5 years in the UK, then any of your children can become British AFTER you become British under this provision, as long as your children apply before their 18th birthday.
Women can lose British Nationality through marriage and through the action of their father whilst under the age of 21 and so there will be some who cannot qualify regardless of the above.
Birth in the UK does not always result in the candidate's mother acquiring British Nationality.