My wolf hybrid always tried to kill my other bitches puppies. In the wild in a pack only alpha's are allowed to breed.
I have both pure wolves and wolf hybrids. I find that the hybrids are unstable. When these two pass I will not own another. The wolves are sweethearts. Anyone could take the male, put a collar on him and talk him for a walk - he may walk you, but Storm would love every second of it. My female is shy and will hide from adults she doesn't know.
Sorry - I read your post wrong. You are correct about the issue of two females having pups - I mentioned adding from outside the pack.
Wolf hybrids are a completely different story and should not exist.