Dear Teocida,
you can still assign a static IP number to your iPad, that could be used on both routers, if they are set to assign from the same private IP range. A typical example for an IP address pool is 192.168.1.10 - 192.168.1.100, that a router would use for all the devices in your LAN. Other manufactures set similar ranges by default. Changes are usually fairly simple to do, but it requires to log into the web browser menus and some adjustments might be necessary. If you are not familiar with such procedures, your router might end up being unreachable and in worst case a hard reset might become necessary. So please consider to ask somebody around, who could help you in person or visit your router manufactures website for a user forum to get some guidance.
Good luck!
RG