Ireland was part of the U.K. so any children born in Ireland would have been British citizens by birth not 'foreign.'
Added- County Tyrone is now in what is Northern Ireland and still part of the U.K.
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Thank you so much! The grandmother was born in England (her parents and older siblings were born in Ireland). Does that mean it works the opposite way too - that as a child born in England to Irish parents, my partner's grandmother was "Irish" by birth ? If so, maybe there's a chance he can get Irish citizenship
