I feel your pain. We lost power for 5 days some years back, and we also had to leave. There was nowhere to put the food - all our neighbors lost power too. We left things in there because, of course, we didn't know how long the power would be out. But after 5 days, the fate of everything in there was sealed!
Please stop beating yourself up about how this could have been avoided. You took care of your kids and went someplace with power. That's the right thing to do.
There's no shortcut here, but the longer you wait, the worse it's going to be. You're going to throw everything out. You just are.
Assemble the following items: a pair of good rubber gloves, a trash can double-bagged with a good black trash bag, a few buckets for hot, soapy water and clean water, some chlorine bleach, some sponges you can toss when done, some beach towels you can wash (or many layers of newspaper), and some rags.
The frozen stuff that thawed out has refrozen, so it's probably not going to be messy. But it's spoiled. Turn off the fridge/freezer entirely. Put on a pair of rubber gloves, and pitch everything from the freezer into the trash. Don't consider keeping anything. Put the ice trays aside or in the sink to wash later.
Open the fridge, and plan on tossing everything out. If you had some fruit in there, it might be okay (whole apples, etc.). Otherwise, everything goes. Don't think about it, don't lament it, out.
Empty everything out. If you have bottles of salad dressing and so on, invert them in the sink to drain the liquid, then you can wash/recycle the bottles. Otherwise, into the trash.
When that's done, remove the shelves and veggie bins and ice trays. Put the larger items into the bath tub and run the shower on them to remove any stuck-on food. Take a sponge of hot, soapy water to everything, rinse and let it drain in the tub. If you have a hand-held shower, that works great. If not, just hold things under the regular shower and turn them as needed. As the sponges get yucky and beyond cleaning, toss them out. You can wash smaller shelves and veggie bins or removable bins from the door - do those in the sink, and drain them in your dishwasher. Don't subject these items to the high heat of a dishwasher washing though. While things are draining in the tub, take hot soapy sponges to the sides and bottom of the fridge/freezer. If anything is stuck, you can also use a paste of baking soda to scrub with a rag. I put beach towels on the floor in front of the fridge to collect the extra water so I don't have a flood. Sweep out the water and debris onto the towels. Dump any of the solids into the trash, and put the towels and rags into the washer.
Finally, take a solution of bleach and water (1/4 cup per 1/2 gallon, according to the Clorox website and others), and wipe down the exposed surfaces that you have already cleaned with soap/water. Let everything air dry, then plug the fridge back in. While it's getting cold, go to the grocery store and stock up.
If you really think liquids have seeped into the cracks in the freezer, you can go on line to get instructions on how to take things apart. You can also contact the help line for the appliance's manufacturer. These things happen all the time, and they know how to deal with them. Or call an appliance repair person or a company that specializes in mold and messes, like Service Master.