You get RAF experience if all of these are true:

a) You are grouped with a toon who is on an account directly linked to your account; and
b) You are within +/- 4 levels of that toon; and
c) You are both 59th level or lower; and
d) The mob is worth experience (green or higher) to both of you; and
e) You are within a certain proximity (range) of each other.

If your chain is A -- B -- C.
Then B could get RAF based on their connection to A or C.
But A and C, are each dependent on having the conditions true in relation to B.