Time before picture? Iphone 4s?

I have an Iphone 4s. I want to if there's a way to get the picture to take in a few seconds rather than right away, because i would like to get into a picture with my family too… Help please?

Take a video, and record. Then after, play the video and take a screenshot of when you look the best.

Press the home, and power button at the same time for 1 second to take a screen shot.