GOP candidate Kevin Nicholson’s brother has donated to his Democratic opponent, Wisconsin Sen. Tammy Baldwin, campaign finance documents show. Nicholson’s parents also donated to Baldwin.

Nicholson, a former Democrat, has acknowledged that he has a “different worldview” than his parents.

Nicholson’s brother Scott donated the maximum $2,700 for the primary to Baldwin’s campaign on Dec. 31, according to Federal Elections Commission documents.

Scott Nicholson was a registered Democrat in New York in 2016, according to voter registration data. He did not return a request for comment. Nicholson’s parents also donated the maximum amounts allowed to Baldwin’s Senate campaign.

Nicholson responded Monday to a request for comment about his brother’s donation with a similar statement circulated after news broke of his parents’ donations.