what genders are these chicks?

[Ghostbelly]

would it be bad if they mate or just if they have chicks?

 

[my sunwolf]

If you hatch out eggs from brother--sister matings, they have a much higher chance of having bad genetics come through than eggs from parent--offspring matings. It's not a problem if a brother mounts a sister, only if you're hatching out the eggs...

 

[Ghostbelly]

ok thanks