GLK, Q5, and GLK are the smallest so I would boot those right away. I have a 2mo old and we are upgrading my wife's FX35 to a Grand Cherokee for more room. Of the rest, I would go with the MDX. That 3rd row could be handy when the kids want their own space. The Lexus is also a good choice but it lacks that key feature. The QX70 is absolutely massive so I would check with the wife to see if she feels comfortable driving such a huge vehicle. I know my wife took one look at the Tahoe and said "this is WAY too big".
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2014 CC R-Line DSG | 2010 S4 Sold | 2010 BMW 135i Retired | 2006 Lotus Exige Sold