Step 1: Understanding the Concept:
The question pertains to a major reform in Hindu personal law concerning the rights of daughters in ancestral or joint family property (coparcenary property). Traditionally, under the Mitakshara school of Hindu law, only male descendants were considered coparceners and had a right by birth in the family property. A landmark amendment changed this position.
Step 2: Detailed Explanation:
The original Hindu Succession Act, 1956, retained the Mitakshara coparcenary system and did not grant daughters the status of coparceners. This was seen as a major source of gender discrimination.
\begin{itemize}
\item To rectify this, the Parliament passed the Hindu Succession (Amendment) Act, 2005.
\item This amendment came into force on September 9, 2005.
\item The most significant change was the amendment of Section 6 of the Hindu Succession Act. The new Section 6 declared that a daughter of a coparcener shall, by birth, become a coparcener in her own right in the same manner as a son.
\item This gave daughters the same rights and liabilities in the coparcenary property as if she had been a son. It effectively equated the status of a daughter with that of a son with respect to joint family property.
\end{itemize}
The other years mentioned in the options are incorrect. The year 2005 is the correct year for this historic amendment.
Step 3: Final Answer:
A daughter is equated with the son with reference to joint family property under the Hindu Succession Amendment Act 2005.