A very quick and easy MC2 Family Tree this time around. Apart from Davida, I don't think any of Kirby family have ever appeared on-panel. We only learn Davida's brother's name because he is mentioned in her profile in Spider-Girl #81. We also learn Davida's full name: Davida Jacqueline Kirby. It would appear Davida's surname is a reference to legendary comic book creative Jack 'The King' Kirby.
If I am mistaken, and Mr or Mrs Kirby have made a cameo someplace, please send me a message.
Until I find a more challenging family tree to explore, I remain
frogoat