Audi A5, A6 or Q5? Any opinions gratefully received

[Mrneedy]

I have an A6, which we can trade in.
I love the A5 shape and it feels a little bit sportier, but it is smaller inside than the A6, feels a bit more cramped
Other alternative is the Q5, which is v roomy, but somehow I don't feel like I can justify it a I only have one child. Is this a bit silly?
I think I am holding out for the A5, as the Q5 is giving in to age and motherhood and sensibleness!!!

If the A5 is too small insidie, how about the A4? Same platform as the A5 but with a saloon roofline instead of a coupe (depends on where in the car you feel it is cramped, I suppose).

inside, not insidie

Well we decided on the A6 because the A4 was a bit small inside.
DH is really big.
But he doesn't really drive much anymore, so he said it's up to me

Mostly it will just be me and DS