Depends on your budget.
If it's for
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family (grandchildren, children) and scenic photos
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then I would suggest that you probably want something like
Tamron 17-50 f/2.8 VC. Wide enough for landscapes and 35mm - 50mm is great for portraits. However it is £530 and only available for pre-order.
They do a non-VC version which is £330 as well.
Personally though, I'd buy the
Sigma 18-125 which is stabilised, well built and covers a really useful range of focal lengths. It's also only £245.

A recent back to back test of this lens and the Nikon 18-105 VR in Amateur Photographer chose the Sigma, mainly on build quality (it has a metal mount while the Nikon has plastic etc.)