If there's already a laptop available, don't buy a Macbook. For web browsing and any app stuff it's much nicer just to use the iPhone or the iPad.
To me the laptop has become a necessity in terms of having to write some longer emails and stuff. But that's only now and then. For everything else, I'll go with my phone or the tablet. More comfy, portable and can be used anywhere. In my opinion the laptop is well on its way into becoming a secondary device.
The money wasted on a Macbook means you'll use the phone and tablet less. Also, you've wasted those money for upgrading your phone and tablet too.