- I have seen them grow up.
- I have watched them grow up.
Though the intended meaning is conveyed in both sentences, I want to know which in this case is a better fit, see or watch.
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(text lifted from John Lawler's comment - he probably won't post it himself, but it's solid stuff)
The basic semantic difference between see and watch (and for that matter, look) is that see is non-volitional, while look and watch are volitional; additionally, watch is durative, i.e, it means that the looking went on for a while. In this context, the best fit is a matter of what you want to imply, and what you want to state, and that's up to the speaker in context.
There are supportable arguments for the use of either word. The sentence is meant to convey that the speaker has witnessed a process, "growing up". "Seen" can be used in relation to an event that occurs in an instant or or one that occurs over a period of time. However, "watched" is appropriate only in relation to an event that occurs over a period of time. Therefore, "watched" would be the better choice here.