I think it's clear. She has British Citizenship from Birth. A Passport is just a travel document confirming that.
So truthfully you should answer "Yes".
But you could also answer "No" if it were beneficial to your case. And see how the Authorities deal with it. Just my opinion.

Well it was no bother in the end. Firstly, we traveled to the UK via Calais - Folkestone. (Eurotunnel) Slight delay at UK Border Control in Calais. The Immigration Officer was unsure of how to treat the German Residence Card. So we waited for his Supervisor. She confirmed this new style of card is ...

I guess the problem here is I don't in my mind see either traveling to Ireland or UK as "abroad" as technically I am a Citizen of both. So we're just going "Home". Of course our Family's center of life is in Germany and I need to get over this mental block. The reason I need to travel with my Wife ...

Surely though my Daughter's freedom of movement as a UK Citizen is denied because she cannot travel alone? My Wife would be escorting her.

Just to be clear. I'm remaining in Germany. So they will not be reunited with me in (Northern) Ireland.
So my Wife will be traveling with our Daughter, who holds a UK Passport.
Wife has only Thai Passport and German Residence card.

No one? Just to summarize. - Wife is Thai with German Residence Card of a Family Member of a Union Citizen. Newly issued biometric card. - Daughter is 2 years old and UK Passport - I am UK and Irish dual Passport holder. Living and working in Germany. Can they travel without me to the UK or to ...

She will be travelling with our 2 year old Daughter. Who holds a UK Passport. If that makes any difference?

As an aside. My Wife had a German RC issued in Jan 2011. It was a flimsy, folded green piece of card with her photo and written almost entirely in German. Stapled in her passport and valid for 5 years. We were at the Auslanderamt about 6 weeks ago taking care of some other stuff and the staff there ...

Thank you Sir. That's just the info I was looking for.
And she can travel without me? For sure?
And Ireland is also fine with this? (she has a flight booked to Dublin later this month)

Just to be clear on this. Does this mean my Wife (Non-EEA Thai) who holds a German Residence Card. Can fly back and forth to the UK and Ireland (Dublin) without applying for a daft EEA Family Permit every 6 months?

Please say it's so!

BTW a big "'Bout Yee!" to all my fellow countrymen. We're not Brazil we're Northern Ireland!

I just admit I was not aware of the 2012 McCarthy Ruling and I'm a little peeved. I was born in N.Ireland, lived there all my life but do not have any known Irish ancestors. I had a UK Passport solely until 2005 when I decided to go travelling. I really wanted a spare UK Passport but they only issue ...

I'll try and summarize to make this quick. - My Wife (Thai Passport) Married to me (Uk & Irish Passports), Daughter (UK Passport) - Wife also has German Residence Card - 5 year renewals. "Residence Card of a Family Member of a Union Citizen" printed on the card. - We all reside in Germany. I am ...