well the father has some heavy branching which would mean he has some rosetail in him, that still makes him a pure Hm rosetail just means he has heavy branching or lots of rays,
none of the fry look to be heavy rosetails but i would suggest breeding them to a Hm female with less ray branching, maybe 4-6 rays
another problem you can get with rosetails is they normally have scale faults, some can have major scale faults, and scale faults can be passed to their fry if bred from
ashley