Answer: The right answer is the (D) No, because a possessive noun comes before the word.
Explanation: Just to elaborate a little on the answer, it can be added that family words such as mother should be capitalized when they replace or are a title for a person's name—"The other day I saw Uncle Tom at the mall" or "When I was in the pharmacy Mother called me," for instance. However, those words should not be capitalized if they are preceded by a possessive, as in the example.