user3029: I currently have a shared account with my dad with just a cloned copy of the private key and I would like to setup a multi-signature account with him. I'm trying to do this with Mycelium, but I can't seem to figure out how to do it. 
My main goal is to be alerted if he spends from the account and I would have to approve of it first and vice versa. When he spends from the account does my wallet get alerted? How does it work on a mobile app?

user35758: Mycelium does not yet offer that feature:
https://www.reddit.com/r/Bitcoin/comments/41hzan/is_there_a_way_to_sign_a_multisig_transaction/
There are some mobile wallets that offer multisig now:
https://bitcoin.org/en/choose-your-wallet

3029: <p>I currently have a shared account with my dad with just a cloned copy of the private key and I would like to setup a multi-signature account with him. I'm trying to do this with Mycelium, but I can't seem to figure out how to do it. </p>

<p>My main goal is to be alerted if he spends from the account and I would have to approve of it first and vice versa. When he spends from the account does my wallet get alerted? How does it work on a mobile app?</p>
 35758: <p>Mycelium does not yet offer that feature:</p>

<p><a href="https://www.reddit.com/r/Bitcoin/comments/41hzan/is_there_a_way_to_sign_a_multisig_transaction/" rel="nofollow">https://www.reddit.com/r/Bitcoin/comments/41hzan/is_there_a_way_to_sign_a_multisig_transaction/</a></p>

<p>There are some mobile wallets that offer multisig now:
<a href="https://bitcoin.org/en/choose-your-wallet" rel="nofollow">https://bitcoin.org/en/choose-your-wallet</a></p>
