From my experience, I´d say it´d be better to get a separate small dog kennel/barrel etc for the other. If they´re well separate they probably won´t interfere so much with each other.
I had 3 sisters that went absolutely everywhere together, did everything together, even the same nest site...They all laid a number of eggs in the same nest. I took out a few and put them under a sensible goose, but the eggs that I Ieft with the 3 sisters either got broken or left out in the...