English Family Portraits in Earlier Times

I was at the Tate Britain with my handy camera [photos were allowed, hooray!] and I found it fascinating how the development of family portraits has changed.
Here's a gem from ca. 1636, going to visit the new baby and mother:

And another, slightly earlier, on the same theme (notice how these two mothers are both impeccable and so are their children):

This eighteenth-century 'two for one' family portrait is also kind of fun (saves money by all clubbing up to pay the painter together, possibly?) I like how the lady in the family on the right seems to be spinning.