we have a Passat 125TDI wagon as the family hack and it is brilliant.
2 baby seats. one is a 4yr old, the other an 18mth old. no issue with rear legroom or front legroom. this car replaced a Manual only Subaru Outback wagon. I guess the liberty will be the same space wise (with auto) but no auto with the diesel. The outback had more legroom but not as much accomplished as a car TBH.
Boot in the passat wagon is massive. Larger dare I say than the outback.
We permanantly carry 2 prams in the back of it. One is a double pram (city Mini jogger double) and the other a single pram/stroller (Maclaren). no issues whatsoever in fitting both of these in the back, with room for some shopping.
Perhaps also consider an OPEL Insignia wagon....
More opportunites have been lost from indecision, rather than wrong decision....
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