Neither, since it is "qualitative data", not "quantitative". Only quantitative data can be discrete or continuous.
(Unless your assigning a numerical "value" to each nationality type, in which case it would be quantitative discrete).
Answer 2:
If considering the percentage, eg 100% Irish, 50% Irish, etc., then it is theoretically a continuous variable, assuming an infinite number of generations. However, in terms of currently existing and past living people, for any nationality, it is a discrete variable.
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It is a continuous variable.
It is discrete even though time itself is continuous.
Discrete random variable
Generally continuous but it is discrete if you look at one cupful, two cupfuls, etc (or spoonful or bucketful).
continuos