Hey you get what you can get on the zoomobile. It doesn't often give great photo opportunities.
It does confirm to me that it is an adult female (the one with the horns), a sub adult female (the one with the small horns just coming out), and a smaller calf (in the other photo it seems much smaller than the other two).
And at least one of those two is likely to be the breeding bull. It's not like they will want to wait for the calf to mature... he couldn't breed with mom and I dont know if the sub adult female is related. She could be his big sister.