Hi, I have two Blue Swedish hens that I got last year and my friend has two Blue Swedish drakes from last year. All of the these ducks came from the same hatch. I was wondering if I got one of her drakes and put it in with my hens would their babies be okay. I am not sure if they are brother or sister or does that even matter with ducks. Also my hens have been running with a Rouen drake and a Cayuga drake so how long do I need to wait until I start collecting the eggs to incubate and know they will be pure Swedish. Thank you vevy much!