Wallet software that forwards funds to multiple addresses?

[Stack]

Hi All!

I was wondering, are there any scriptable bitcoin wallet clients out there, that can act as a gateway, detecting a confirmed incoming transaction and creating outgoing transactions to forward those funds - in order to share transactions among many wallets?

What I would like this to do, is to become a joint wallet, so that any incoming transaction to this wallet, are forwarded: 50% to owner A, 50% to owner B.

Is there any existing software that could handle this kind of task? or be extended to do so?

Many thanks in advance