Lost in the Nether land and can't find portal to return?

You can change the game mode for this world to survival temporarily. I'm doing this on the Windows 10 Editon now, but the android version of the game should work the same.

1. In the main menu, tap Play

2. Tap the pencil icon next to your son's world.

   

3. Set the world to survival by tapping Survival

   

4. Enter the world and take a hot bath in lava. Respawn in the overworld, rejoice, and quit to main menu again.

5. Repeat steps 1-3, only setting the world back to creative this time.

This is assuming that your spawnpoint is close to where you want to be in the overworld. In any case, finding your sons builds in the overworld should be easier than locating a nether portal in the nether.

Press F3, I've read on multiple forums that the portal is usually located at, or around 0, 0.. if you still can't find it around 0, 0 start at that point and spiral outwards, you should be able to find it eventually.

In such a situation, once you create a Nether portal make a second backup of the game to know the coordinates. Once done, go to the original world and go through the nether, make a chest there and add important items such as stone blocks, obsidian, and lighters. A plus point in the Nether is you can track the path you take by lighting the way. It's better than maps.

However, a good supply of lighters is required, whenever you go to the Nether make sure to have an empty locator map from the original point, carry a pickaxe because you can only mine soul sand with bare hands in the nether. If all else fails, I'd suggest never to bring the most important items to the Nether and just die if the portal glitches

Switch to creative mode and make a 4×5 wall of obsidien with the six center blocks removed and hit it with a blaze charge this will make a portal back to the overworld. You wont be back where your original portal was but at least your out of enderland. A good way to keep from getting lost in the future is to keep plenty of blank maps with you (craft from 9 papers or 8 papers and a compass) and use them every time you reach someware new. It can be taxing to do this but it will pay off in the long run. Also if he is in survival mode and he slept in a bed before entering enderland and dies in enderland not only will he re-appear in overworld he will be next to the bed. Not sure if this helps you but it has saved me many times.