user1888: How can I share my bitcoin wallet with my family members? Such that if my grandmother spends one btc one day, I see that reflected on my computer, etc.
This is also a great safety mechanism, in case one of our family member's hard drive crashes, the other members will still have the wallet.

user153: Electrum is a client that uses "deterministic keys", and thus multiple installations of the same wallet seed are supported.

http://ecdsa.org/electrum
http://en.bitcoin.it/wiki/Electrum

(The only exception is if you import keys generated externally, an Electrum wallet those transactions are exclusive to the wallet in which they are imported.)
Also, Blockchain.info/wallet has a Desktop Sync feature which will keep your Bitcoin.org client's wallet.dat in sync with your Blockchain.info/wallet, and vice-versa.  That doesn't mean you still don't need to backup your wallet.dat as it may not always sync perfectly but it does give a remote way for others to access your wallet.dat

http://Blockchain.info/wallet


user1420: If you're looking for something technically straight-forward, I suggest using an "e-wallet" and giving your partner access to the wallet account.
Review these links:
https://en.bitcoin.it/wiki/Browser-based_wallet
And here are several e-wallet's listed:
https://en.bitcoin.it/wiki/Category:EWallets

1888: <p>How can I share my bitcoin wallet with my family members? Such that if my grandmother spends one btc one day, I see that reflected on my computer, etc.</p>

<p>This is also a great safety mechanism, in case one of our family member's hard drive crashes, the other members will still have the wallet.</p>
 153: <p>Electrum is a client that uses "deterministic keys", and thus multiple installations of the same wallet seed are supported.</p>

<ul>
<li><a href="http://ecdsa.org/electrum" rel="nofollow">http://ecdsa.org/electrum</a></li>
<li><a href="http://en.bitcoin.it/wiki/Electrum" rel="nofollow">http://en.bitcoin.it/wiki/Electrum</a></li>
</ul>

<p>(The only exception is if you import keys generated externally, an Electrum wallet those transactions are exclusive to the wallet in which they are imported.)</p>

<p>Also, Blockchain.info/wallet has a Desktop Sync feature which will keep your Bitcoin.org client's wallet.dat in sync with your Blockchain.info/wallet, and vice-versa.  That doesn't mean you still don't need to backup your wallet.dat as it <a href="http://bitcointalk.org/index.php?topic=109774.0" rel="nofollow">may not always sync perfectly</a> but it does give a remote way for others to access your wallet.dat</p>

<ul>
<li><a href="http://Blockchain.info/wallet" rel="nofollow">http://Blockchain.info/wallet</a></li>
</ul>
 1420: <p>If you're looking for something technically straight-forward, I suggest using an "e-wallet" and giving your partner access to the wallet account.</p>

<p>Review these links:
<a href="https://en.bitcoin.it/wiki/Browser-based_wallet">https://en.bitcoin.it/wiki/Browser-based_wallet</a></p>

<p>And here are several e-wallet's listed:
<a href="https://en.bitcoin.it/wiki/Category:EWallets">https://en.bitcoin.it/wiki/Category:EWallets</a></p>
