as mD said, you will need a minivan... even if you fit 3 seats in 2nd row, the trunk space is not enough to carry all the necessary things which come with triplets...

Honda Odyssey is the closest to handling to BMW... Go test-drive Touring version (non-PAX!)

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive