Wisconsin Governor and likely presidential candidate Scott Walker and his family disagree on whether gay couples should be allowed to marry.

Walker, who is expected to jump into the race for the Republican presidential nomination next week, called the Supreme Court ruling striking down state bans on gay marriage a “grave mistake” and has repeatedly called for a constitutional amendment limiting marriage to heterosexual couples.

In a The Washington Post profile, Tonette Walker revealed that she and her sons Matt and Alex disagree with her husband on the issue.

“That was a hard one. Our sons were disappointed,” she said of Walker's statement on the ruling. “I was torn. I have children who are very passionate, and Scott was on his side very passionate.”

“It's hard for me because I have a cousin who I love dearly – she is like a sister to me – who is married to a woman, her partner of 18 years,” she added.

Walkers' then-19-year-old son, Alex Walker, was one of the two adult witnesses to the June 9, 2014 wedding of Shelli Marquardt and Cathy Priem. Marquardt is the first cousin of Tonette Walker.

Scott Walker said in April that he attended the women's reception but was unable to attend their wedding.

(Related: Scott Walker says he's attended a same-sex wedding reception.)