What the difference of the two behalf?

Could you tell me the difference in use of behalf?

(1) on behalf of

(2) in someone's behalf

I can't see the feelings of the two. so please explain this.

Acbeat(1) on behalf of

I will pay the tuition on behalf of my friend. (My friend is going to school but he does not have any money for tuition. I am paying it.)

Very, very rarely the preposition "in" is used in place of "on."
Fraze.it cites 67 instances of "in" and over 9,000 examples with "on".


▸ noun: as the agent of or on someone's part (usually expressed as "on behalf of" rather than "in behalf of") ("The guardian signed the contract on behalf of the minor child")
▸ noun: for someone's benefit (usually expressed as `in behalf' rather than `on behalf' and usually with a possessive) ("In your behalf")


On Behalf of vs. in Behalf of: Usage Guide (Merriam-Webster)

A body of opinion favors in with the "interest, benefit" sense of behalf and on with the "support, defense" sense. This distinction has been observed by some writers but overall has never had a sound basis in actual usage. In current British use, on behalf (of) has replaced in behalf (of); both are still used in American English, but the distinction is frequently not observed.

Personally, I only use 'on behalf of', and only in the sense of 'as a representative of': I signed on behalf of my son.

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Thank you Califjim!

Then can I add a question? If you may, see the following.

The next question is the difference between (a) and (b).

(a) on behalf of

(b) on someone's behalf

And if you like, I would like to see me an answer with usage examples.

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(a) on behalf of (someone)

(b) on someone's behalf

These are two ways of saying the same thing. "someone" is used in definitions to represent any word that refers to a person. It has nothing to do with "behalf".

There are other cases where
X's (before a noun) = of X (after a noun)

a decision in Tom's favor = a decision in favor of Tom
in the manager's place = in place of the manager
to speak with the group's members = to speak with members of the group