Vorbarra house colors are black and silver (at least, that's what the GURPS Vorkosigan book says); service parade colors aren't house colors.

I don't believe we know Aral's middle name. I thought we knew Aral's brother's name, but the Vorkosigan Wiki listing for Aral doesn't mention it, nor does the listing for Piotr mention his father. Huh.

Padma's listing is short & doesn't mention his father.