Leave the kids at home.
If you wanted to go used you could easily get a Honda Element which has tons of room for under 20k. In new cars you could look at a Nissan Versa which has a surprising amount of room for a small car.
An example of a metallic element that occurs as a liquid at room temperature is mercury. An example of a nonmetallic element that occurs as a liquid at room temperature is bromine.
The 2013 Honda Civic has 34.3 in. of rear head room.
The 2008 Honda Civic has 42.6 in. of front leg room.
The 2012 Honda Odyssey has 63.3 in. of rear shoulder room.
The 2009 Honda Odyssey has 64.4 in. of rear hip room.
The 2012 Honda Crosstour has 37.4 in. of rear leg room.
The 2005 Honda Odyssey has 40.9 in. of front head room.
The 2005 Honda Civic has 37.2 in. of rear head room.
The 2012 Honda Pilot has 41.4 in. of front leg room.
The 2006 Honda Accord has 54.6 in. of front hip room.
The 2014 Honda Ridgeline has 57.1 in. of rear hip room.