A lot has changed about passports even in my lifetime (I’m in my early 40s). I remember my mother showing me one of her old British passports, which had my younger brother on it.
The UK abolished family passports in 1998, so since then it has been impossible for a person to add their spouse or minor child to their British passport, your spouse/child needs a British passport of their own-even a newborn baby
Whereas, our other nationality, Australian (I, my mother and my siblings are all dual Australia/UK citizens), I’m not sure if it ever had family passports, but if it did, it must have abolished them significantly before the UK did
The UK abolished family passports in 1998, so since then it has been impossible for a person to add their spouse or minor child to their British passport, your spouse/child needs a British passport of their own-even a newborn baby
Whereas, our other nationality, Australian (I, my mother and my siblings are all dual Australia/UK citizens), I’m not sure if it ever had family passports, but if it did, it must have abolished them significantly before the UK did