Joe Biden has repeatedly claimed on camera that he is "Irish" Quote: I am Irish.
The press is writing: Biden's victory was celebrated in his ancestral home of Ireland as well
The Geni tree shows the Biden ancestors are entirely from England, not Ireland. Usually one regards an "ancestral homeland" as the paternal one. It is clearly not Irish unless the Geni tree is wrong.
On his mother's side he has some great-grandparents who were Irish.
Trump's father's family was Bavarian but he never claimed to be German. Neither did he claim to be Scottish, although his mother was Scottish.
Conclusion: Joe Biden is as Irish as Trump is Scottish. But please do check the supposed Biden Irish ancestry which is not apparent on the Geni tree- with the immigrant/emigrant Biden born in "England".