Can i host a minecraft server?

So we have 2 routers, they both run ddwrt. We have a bridged connection to the second router which i'm connected. Do i have to forward a port on both routers?
Its basically like this

Internet - Router 1 -[BRIDGE] - Router 2 - My computer/xbox Etc.
|
My Mom's computer

Added (1). Was supposed to be like this

Internet - Router 1 -[BRIDGE] - Router 2 - My computer/xbox Etc.
.|
. My Mom's computer

I would think you only have to do it on the router connected to the internet because the bridged router acts more as a switch to extend the main routers range of devices. Meaning the typical setup of two routers is to turn dchp off on the second router. The main router would be responsible for assigning all of the ip's as well as opening any of the ports.