Can you please offer me some great poses for a group of 3 children?

you could always do the laying on each others backs...

Have them lay on their backs with heads together, bodies rotated 120 degrees from each other and shoot them from overhead.

I have had my granddaughters use a stepladder and posed them (7) around and on the ladder.

jdpence wrote in post #15636108
Have them lay on their backs with heads together, bodies rotated 120 degrees from each other and shoot them from overhead.

ive done this before comes out great.

I have had the older 2 arm wrestle with the younger behind the hands.... always nice. Works better with boys of course

I think you have a take group unfold naturally photos. For example, you could pose the group on a staircase so they are all sitting on different steps. This will easily break up any patterns of head levels so the group looks like one and no pattern distracts the viewer. You could do the same thing by placing the group on fallen down logs or on boulders or any other uneven surface.

try having them lie down on their stomachs.