The bad blood is boiling over again between members of the Gotti family and Guardian Angels founder Curtis Sliwa.

The family is livid about a Page Six story on a wedding Sliwa and John Gotti Jr. attended over the weekend. We wrote that Sliwa and Junior — who was accused of kidnapping and attempting to murder Sliwa back in the ’90s — were kept on the opposite sides of the room at the Staten Island nuptials.

Sliwa even told us that he was “mad-dogging” — translation: shooting nasty looks at — Junior all night and that “people were reminding me this was my friend’s wedding — don’t make a scene; don’t get into a dust-up.” (Sliwa only said he was staring at Gotti Jr., and not vice versa.)

Now, the Gottis are accusing Sliwa of playing up the situation for press. Gotti Jr.’s sister Angel tweeted in response to our story, “Sliwa still whoring I see. Big mouth trouble makers NEVER change, always desperate for attention … It was a BEAUTIFUL wedding you Doofus!”

She told us when reached for comment, “[Sliwa would] sell his kids for attention and publicity. I don’t know who is worse, he or [Gambino family turncoat] John Alite. Two [people] who can’t seem to get attention unless they’re lying about Gotti, Gotti, Gotti!”

Either way, Frank Gotti Albano, grandson of the Dapper Don, chimed in by tweeting: “I sat next to my uncle the entire wedding we had a great time.” He added of Sliwa, “I think he was jealous that more people from the wedding came to our side of the room and lined up to take pics [with] my uncle and my family and no one gave a s–t he was there wearing his goofy red beret.”

Sliwa — who founded the Guardian Angels in 1979 and is now a radio host — was kidnapped in a stolen taxi in 1992 and shot multiple times by a gunman who had been hiding in the front seat. Gotti Jr. was tried but never convicted. (An online commenter darkly joked of Sliwa’s attendance, “Did he come in a cab?”)

The colorful nuptials were for AM 970 host Frank Morano and Rachel O’Brien.