""We'll be in labor"? Sorry - only the woman is in labor."
Uh, OK. How about just wishing them well and forgetting the lapse in grammar? Fathers don't go into labor, but it's a stressful time for them, too.
Be a little generous, OK?
I think if I am not mistaken, its called humor.
Good Luck and Prayers for the soon to be Proud Parents.
I wish them all the best but men don't go into labor or give birth - at least not yet.