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The minhag I've seen is that a levi washes the hands of the kohen before he recites the birchas kohanim.
I have often seen numerous Levittes teaming up to wash a kohen together - each of them grasps the cup at a different point, and together they wash.
Is there any reason for a levi to do so if another levi is already washing? (Please provide sources)
According to this answer, the reason to have a Levi washing the Kohen's hand is because there is some sort of tosefes Kedusha when washed by a Levi. As long as the person washing is a Levi, there would be no need for other Leviim to bother joining in.
(This is to disprove any claim that there is a minhag or obligation for the Levitte to wash the Kohen's hand, which could therefore obligate the Levitte to participate in any way possible.)
Mishna Ketubot 2:10
אלו נאמנין להעיד בגודלן, מה שראו בקוטנן: נאמן אדם לומר, זה כתב ידו של אבא, וזה כתב ידו של רבי, וזה כתב ידו של אחי.... ושהיה איש פלוני יוצא מבית הספר לטבול לתרומתו...
These are trusted to testify as an adult what they saw as a child: a person is trusted to say this is my father's handwriting, and this is my teacher's handwriting, and this is my brother's handwriting... that so-and-so would leave school to dip [in a Mikvah] to eat Terumah...
It's important to have Levi children going out to wash the Kohanim's hands so that they remember that they are Leviyim. This could be one reason to have multiple people washing the hands of an individual Kohein: a Minyan with many more Levi children than Kohanim (or one where Levi children below bar mitzvah are only allowed to wash assisted by an adult/parent).
Everyone else should stay inside and participate in the prayer service since they aren't needed elsewhere and God isn't taking a break from listening to our prayers (Teshuvot veHanhagot 3:48, who calls the practice of multiple Leviyim washing together "unclear", though he recommends even adult Leviyim occasionally make a point of being the one to leave and go wash so as to retain their public presumption of being a Levi).
In this day and age a person may have the tradition passed down to him that he is a Levi but we cannot be 100% certain if it is fact.
There are indeed halachic rulings that acknowledge the difficulty in proving whether someone is a Levi: ma'aser rishon (the first tithe) should be given to a Levi - but since nobody can prove beyond doubt that they are a Levi and the obligation to give it to a Levi is unenforceable, the owner himself may keep it.
If multiple people that have a tradition in their family that they are a Levi wash the hands of the Kohen together, then perhaps there is more certainty (or a better chance) that the Kohen's hands were indeed washed by a Levi.
