Okay, I have to ask exactly when was it established that the Kirk family has a long history in Starfleet? Because outside of Kirk and his father I haven't heard of any other Kirks in Starfleet.
Well, no, it wasn't established, but it's not an unreasonable conjecture given that Jim Kirk is at least second-generation Starfleet and given that both his parents were in Starfleet. It's something that I've always had the impression was probably the case. And it served my purposes in this particular work to assert that it was the case.