Here in the US you are under no obligation to tell them, unles you require special accomidations to do the job because of it.
But you will not have worked long enough for the Federal Leave policy to cover you, so it is possible if you take off to long, you won't have a job when you come back.
Also if this is in the US, 12 weeks ? Are you expecting trouble with delivery? If this is a normal delivery most companies will be expecting you back in 6 weeks, 8 at the most unless there were problems.
If you have been at your current place of business for long enough, you will have a lot more rights to take a longer period off and keep your job.
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