Last public speech Abraham Lincoln

[Eva Elisabeth]

I'm trying to find a reference that I read somewhere that Tad begged to hold the candle and Brooks handed it to him.

I think it's Elizabeth Keckley:
"A lamp was brought, and little Tad at once rushed to his father's side, exclaiming: 'Let me hold the light, Papa! let me hold the light!'
Mrs. Lincoln directed that the wish of her son be gratified, and the lamp was transferred to his hands."