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This will encourage the branches to grow stronger and thicker. Finally, trim the remaining branches by taking off 20% or so of the growth they put on last year.Thin out the remaining branches until you have 6 inches or so airspace around them.

Again, in the top photo I can see a few branches that are brushing against the wall of your house. Take off any branches that are growing back towards your house or fence.

These are branches that grow absolutely straight up to the sky. These cuts should be flush with the trunk, taking care not to damage the collar - the small swelling where the branch connects to the trunk. I believe I can see at least one sucker in the top photo - it looks almost like a new trunk coming up 6 inches in front of the main trunk. These are branches that are sprouting from the ground near the tree or from the trunk below your first graft point.

Take off any wood that is dead or diseased.

Now that you know how far back you do not want to prune, let's figure out what you do want to prune out: As you are pruning, keep in mind that if you cut a grafted branch off or cut it back so close to this graft that it will have no branches/leaves left, you will lose that variety altogether. Since you have multi-graft trees, there should be one graft at the point where each main branch comes off of the trunk. Before you start pruning a tree, you should find all of the graft points.