Patti Davis told the New York Times this week that she believes her father would back gay marriage if he were alive today and that he would be "puzzled" by the need for the current debate.
"All I know is the heart of the man who raised me as my father," Davis said.
But Reagan's son, Michael, who is Patti Davis's half-brother from a different marriage, told Post Politics that people shouldn't be making assumptions about where the president would stand on the issue today.
"You’d have to ask him," Michael Reagan said. "I think my father gets dragged into too many things" concerning what he would do today.
Michael Reagan added: "Back in the 1980s when he was president, no, he wouldn’t have. ... It’s easy to say he would do or not do something when he’s not here to answer."
Michael Reagan wrote an op-ed this week arguing that gay marriage would be a slippery slope "leading to other alternative relationships and the unconstitutionality of any law based on morality." He appeared on CNN on Wednesday to defend that position.
In the interview with Post Politics, he emphasized that his father was not a "bigot" but that he believed in traditional marriage between a man and a woman.