My children have my partner's surname. I did not change my name.
When I (often) travel alone with them I take a signed letter from my partner as per the guidelines on the FCO website.
It lives in my passport.
I also have a photo of their birth certificates on my phone, but have never needed it.
It's very simple and has never caused me any problems.
Caveat: none of us are brown.
@mashton started
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My children have my partner's surname. I did not change my name.
When I (often) travel alone with them I take a signed letter from my partner as per the guidelines on the FCO website.
It lives in my passport.
I also have a photo of their birth certificates on my phone, but have never needed it.
It's very simple and has never caused me any problems.
Caveat: none of us are brown.