What does Irish twin mean?

What does Irish twin mean?
A spoken definition of Irish twin.

Intro Sound:
Typewriter - Tamskp
Licensed under CC:BA 3.0

Outro Music:
Licensed under CC:BA 3.0

Intro/Outro Photo:
The best days are not planned - Marcus Hansson
Licensed under CC-BY-2.0

Book Image:
Open Book template PSD - DougitDesign
Licensed under CC:BA 3.0

Text derived from:

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[PatriciaPageMosaicArtsCrafts]

That looks like the British museum library ?

[John-eggy]

Does da second feel like if he is adopted 😅