First, make sure the request is not a scam trying to trick you into sending money to someone you don't know! If you're confident in the legitimacy of the request, follow these steps:
1. Download a free Bitcoin wallet from your mobile phone's App Store. Follow the setup instructions; this will generate a Bitcoin address for you, which works similarly to a "bank account number".
2. Bring cash, your phone, and a photo ID (driver's license or passport) to our ATM. Register at the ATM (usually takes 3 minutes, but it can take up to 30 minutes). Once registered, follow the on-screen instructions to purchase Bitcoin. The cash you insert will be converted into Bitcoin and sent to your phone's Bitcoin wallet.
3. Send the required amount from your mobile phone to your family.
That's it!