object knows which object called it?

[Reckoner]

hi,

I have the following problem: I have two objects, say, A and B, which
are both legitimate stand-alone objects with lives of their own.

A contains B as a property, so I often do

A.B.foo()

the problem is that some functions inside of B actually need A
(remember I said they were both standalone objects), so I have to
often do:

A.B.foo_func(A)

Which is kind of awkward.

Is there some way that B.foo_func() could somehow know that it was
called as a property of A in this way?

Note that I'm looking for the calling object and NOT the calling
function.

Thanks in advance.