mikeym wrote:The answer to this might be obvious, but I wanted to get some advice from others more knowledgeable than I before giving up!
My mother was born in the UK (1971) and was a British citizen (not by descent). Later on in life, however, she renounced her citizenship (1990) for citizenship of another country which did not permit dual nationality. This renunciation happened five/six years before I was born.
Is there any chance of me being eligible for British citizenship by descent, seeing as she was not a British citizen at the time of my birth?
If you mean that she went to the British Embassy/High Commission and signed forms to formally renounce her British citizenship- then she's not British and neither are you. However, if in fact all she did was sign forms under the law of another country and/or hand over her British passport, then these acts in themselves would not have caused a loss of British citizenship.
It it happens that she was born in Northern Ireland, then her renunciation of British citizenship would not have affected her Irish citizenship.
And, if she had to successfully reclaim her citizenship, would this in any way affect those chances or those of my minor siblings?
If she formally renounced her British citizenship to acquire or retain another citizenship, she has a once-only chance in life to resume it. Obviously- this could cause loss of the non-British citizenship concerned but not if laws in the other country have changed since then. Example- Malta.
If she resumes British citizenship it doesn't help you but it could allow any under-18 siblings to apply for British citizenship under section 3(1) of the British Nationality Act 1981. See page 15 of guide MN1. How close are these siblings to age 18?
https://www.gov.uk/government/uploads/s ... y_2017.pdf
This is not intended to be legal or professional advice in any jurisdiction.