Not the first movie to tackle that subject and it won't stay the last. It's difficult to steer through a thin line and make something like this work, without falling off to one side and/or the other. This movie does go off quite a few times, which is a shame. The boy does his best in the broken down department, so good actually that you do wonder, how and why there is no other help available.
Our main actor/actor has the usual single life he does not want to give up (in this case the girlfriend already exists with a little spin to the whole "kid" thing). The "little guy" messes up our "big guys" life in such a way, that is beyond redemption and comprehension. All in the name of "comedy" obviously, you'll be the judge to say if any of it works (occasionally there is a hint here and there, that actually sparks something). Run of the mill though there have been worse
