Re Alice's wedding and inviting the neighbours/their daughter
I believe they hadn't been neighbours that long.....
I think that Alice's father moved to his current house after he got together with the stepmother. Despite what Alice claimed the tragedy of her stepsister did not happen in her childhood home. The other houses in that development (all with similar themed names) were all new build in 2005/2006.
Alice's brother's wife and her parents (who are close neighbours in he same village) are in a much older house original to that village.
Assuming that this is correct, and the fathers house was newly built/ purchased 2005, then Alice's brother would have been 35 and unlikely living there. His future wife would have been 19.
It makes it even weirder that they were all invited to the wedding.
Of course it's possible they lived previously elsewhere in the same village as Alice's father....
also alice views her sister in law's mother as her "mother" but she's only ten years older than Alice!