Dumbo is recessive. If you hold back het dumbo females and breed them back to a dumbo male the resulting litter should be approximately 50% dumbo.
So, your second generation babies should be 50% dumbo babies and 50% het for dumbos with standard ears.
Your hairless looks like a double rex hairless to me. If you breed him to a normal female you should get a bunch of rex babies.
If you have any other questions I would be more than happy to help you out.
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