I get such a strong image from the girls names! They make me think the mum would be a very "girly" type - I expect she'd have pink nails and perfectly dyed/styled hair, and she wouldn't be seen without make up. She's a sweet woman - her name is something like Carly - and she refers to the girls as "my little princesses" and dresses them in matching outfits.
The girls would be sweet but a bit precious - like they'd be the kind of little girls who don't like to paint or play outside because they hate getting dirty. They don't like little boys either.
The house would be a new build, everything inside would be different shades of grey/lots of crushed velvet/'live love laugh' plaques on the walls, and really tidy. They're not pet people.
Dad has a good salary from a manual job like a plumber or electrician - mum is a TA in the kids school but also has a side business - maybe Avon or something similar. Or maybe she owns a small business - some kind of salon. They holiday at the same place in Spain or Turkey each year.
I get such a strong image from the girls names that I can't picture little Xavier and he's sort of not really in the family I have created! If the family I imagined had a son, I'd expect him to be called Freddie/Reggie/Ronnie - on of the East End gangster baby names which are back in fashion recently.