('formal') The person to 'whom' we spoke to was very helpful. = ('formal') The person 'whom' we spoke to was very helpful. = (more commonly) The person 'who/that' we spoke to was very helpful.
('formal') Her brother, 'whom' I met last year, is an attorney. = (more commonly) Her brother, 'who' I met last year, is an attorney.
('formal') To 'whom' did you speak? = ('formal') 'Whom' did you speak to? = (more commonly) 'Who' did you speak to?
(..) the Throne. Aerys reigned, whom they called the Mad King. You're Aemon Targaryen. What happened to your face? Greyscale. Everyone advised me to send (..)2015 TvShow: Game of Thrones Title: Kill the Boy Season: 5 Episode 5