('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?
(..) And to that I hold. I would rather share one lifetime with you... ...than face all the Ages of this world alone. I choose a mortal life. -You cannot give me this. -lt is mine to give to whom I will... ...Like my heart. Strangers from distant lands,friends of old... You will unite,or you will fall. (..)2001 The Lord of the Rings: The Fellowship of the Ring