How to join an external minecraft pe server?

My brother and I usually play on one game but he is going to connect to a different Wi-Fi. Is there a way to connect to his game using his Wi-Fi ip. Can someone give me step by step instructions?

Added (1). And I'm trying to avoid downloading anything or doing anything online thanks

Yes there's something you can download called hamachi or tummbler they are external ip programs aka lan programs that will trick your computers into thinking its using the same router so you can continue to play ( i do it all the time with everything i use.)

No, you can't connect to regular Minecraft servers with Minecraft PE. You can only join Minecraft PE servers.