You guys can ask or dare:
*This next part may contain a spoiler, so be warned.*
If you want to ask dead Feathertail something, ask Dead Feathertail, not just Feathertail. You can ask Crowfeather or Squirrelflight, just say so. (I'd prefer if you asked Crowpaw and Squirrelpaw.)
And if you want, you can ask Purdy, Firestar, Leafpaw, etc. Anyone alive during the second series.
Also, guys, I'm only on the second book, but I know spoilers. So, If I get something wrong, please tell me what, and how to fix it and I will.