Hilary Duff and Mike reunite again for a Family Breakfast with Luca

Lizzie McGuire alum Hilary Duff and former hockey star Mike Comrie have been co-parenting their son Luca, 3, in peace. But is there trouble in amicable paradise?

According to E! News, Comrie recently filed his divorce response in a Los Angeles Superior Court, and he is asking for joint legal and physical custody of their preschooler.

This raises the question if a possible custody battle brewing, since Duff’s initial file asked for primary custody of their son, with visitation rights for Comrie.

As well, Comrie, 34, asked that their assets and property be divided based on the terms of their prenuptial agreement.

After five years of marriage, the couple announced their separation in January 2014, and the Younger actress, 27, filed for divorce in February 2015.

“They remain best friends and will continue to be in each other’s lives,” Duff’s rep said in a separation statement, calling the split amicable. “They are dedicated to loving and parenting their amazing son, and ask for privacy at this time.”

Duff has since dished on their break-up.

“I don’t want to sound bitter because I’m definitely not, but I don’t know if people are meant to be together forever,” she recently said.

She added: “Things happen over a long relationship that you can’t always fight. A marriage of 20 years, the accomplishment of that must feel really great, but there are also huge sacrifices. I just always want to fight for happiness.”