Dropping finch eggs?

How do you know it is a male and female, were they DNA tested? Do you know for sure they are not blood related? Do you know their genetic history IE: mom & dad? See, this is what happens when you bring in birds from wherever. If they are related the egg destruction will continue, and if one were to make it, they'd kill it within 48 hours. Also genetics, a bird knows if their hatchling or egg is defective so it is natural for them to destroy it. Us humans can alter some things but not everything. Id seperate them, its breeding season so don't encourage the behavior the female could die at this rate. I know their a pair, I know they might have been together many moons. The truth is you only know what you've been told. The best route is to not encourage the behavior and take stress off the hen (female). Seperate them, and don't let them see each other until Aug (end). They can hear each other but not see each other. And dont put them next to each other-I hope this helps..