Redhen...actually the big one circling is most likely Mother. That young one looks likes a spring baby so not quite a year old yet...she will hunt with her kids for up to one year. I could not see the young ones tail clear enough to tell you if he was in transition already or not so I am guessing at the age by the chest markings, wing barring and size. They have 1 - 3 babies usually and usually only 1 survives to a year old. Unlike eagles who mate for life, hawks do not stay together year round nor always have the same amte, they meet each year in the same place and nest in the same place. They get killed in fences and by cars a lot...simple reasoning...their eyesight. While they have a keen eyesight just as the eagle, the hawk is a target fixator unless other raptors, especially eagles. Example: a mouse in a farmer's field....a hawk will see the mouse move, target the mouse and dive for the kill...never seeing the farmer on the tractor in the same field, never seeing a fence or the scarecrow 20' away....all it sees is its target. The main reason the Redtail Hawk is the most accurate killer of the raptors. Now that same scenerio but the eagle see the mouse. The eagle sees the mouse, the farmer, the fence the scarecrow and etc...it evaluates all aspects of diving for the target and as it does so, it watches all other moving things around the target. Making it also a lethal predator and less likely to fly into that fenceline and break its neck or get tangled up. They are amazing creatures and I love them but not around my birds.
If there is no mark on the hawk, I bet your roos hit him and broke the neck...they most likely would have jumped him from behind.... If it is any comfort to you, your girl was most likely dead before the carnage began...most likely the hawk broke her neck as that is where they strike and how they kill....or the back.