What do i need to change? lens or body?

[RichardTaylor]

For the first one try focussing (centre point only) on the eyes and recomposing and possibly use a smaller aperture. What shutter speed and aperture did you use?

For the second one if you want everybody in focus you will need to use a smaller aperture to increase your depth of field. I would try F11 or even possibly F16. What were your settings for this shot?

[MrJones]

your equipment is just fine.
what you need to do is learn about depth of feild
i suggest you start by redeaing this post Online Depth of Field Calculator