This is an interesting examination of Glorfindel's possible history. I like the fact that you not only give him a developed personality and backstory, but enable the reader to imagine his father and brother as well. Made we wish it was the beginning of a story instead of a one-shot character study. Love to know more about his mother’s bio. Wonder if she was Vanyarin? If so, which I think is likely, poor thing to be stuck there in Gondolin with all those crazy Noldor. (Well, I guess at least some of the crazier ones were someplace else.) I've always been interested in the fact that 90 percent of the Noldor (women and children included) went to M-e. They had to have been a pretty fed-up bunch. Oops, I must stop! I'm getting carried away with my own canon speculations here.
Interesting story though to make me want to expand and think about the environment surrounding it.

So glad to see you posting here!