How do I send a picture from my iphone 5 verison to someone else?

OK, there are two ways you can do this.
1st way is that you go to your messages and pick the person(s) you would like to send the picture to. Then you press the little camera button right next to where you type (which is on your left). After pressing that, some photos will show and some other options will show up. If your photo does show up immediately, then pick it and press the send one picture button. When you are done with that then press send and your sister should see it. If your picture isn't showing immediately, then press photo library and press moments. select the picture you want and press send. If your picture is in your send box, then press send again. Then it will send.
2nd way you can do it is you can go into your photos on your home-screen. Select the photo you would like, you should be in full view of this photo, if you are look into the left bottom corner of your phone. There should be a box with an arrow sticking out of it, press it. Then press next at the top right corner of your screen. After you do that press messages which is green. Then scroll to the top of the screen and select who you want to send it to. After you are done with that, press the send button and it should send. I find the first way easier, but it all depends on you. Hope this is helpful!