Similarly, i can't be doing with the 'half' nonsense, or 'step' either.
We have three daughters.
My wife had two of them with her first husband, and we had the thrd together, but they are all my daughters, and they all refer to each other as sisters - and I would take issue with anyone who said different.
When my wife and first married, there was the usual "You'l be wanting 'one of your own' now won't you?" to which i used to reply, "What do your think our daughters are - house guests?"