Big enough for two adults and three kids.
Toyota trucks and SUV's have had SEVERE frame rust issues including some rusting completely in half so you might want to get a Ford double cab instead.
NO I am not joking about the rusting in half. See it here: Toyota SUV?s and trucks rusting in half
http://www.toyotaframerust.com/
Youtube video of a Toyota that rusted in half.
http://www.youtube.com/watch?v=INujD8kuc5s
Now to the Ford.
The facts are clear: The Ford F-150 can haul more cargo and tow a heavier trailer than any of its competitors.* And F-150 has a fully boxed frame that's the strongest in its class.* Engineered and tested to withstand more punishment than your most difficult tasks can subject it to, the F-150 is Built Ford Tough to come through with the dependability you expect in this full-size pickup. And this, at the end of the day, is what capability is all about.
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See the Ford here: http://www.fo