Ashlee Simpson and Pete Wentz are on two totally different pages when it comes to the custody of their 2-year-old son, Bronx, PEOPLE reports.

When Simpson filed for divorce last month, she indicated she was seeking full custody with Wentz getting visitation rights. Wentz, however, filed papers Tuesday in Los Angeles Superior Court seeking joint custody of Bronx. He also asked they each pay their own lawyer fees; Simpson had requested that Wentz pay all the legal fees.

Legal experts tell PEOPLE it's hard to tell whether this will blow up into a full custody battle or if Bronx's custody will be figured out amicably because the divorce papers have very limited detail.

"There's no fire. It's a very straightforward response asking for joint custody and fair distribution of attorney's fees. He's not gearing up for a custody war," a source close to Wentz told PEOPLE.

Simpson filed for divorce last month after two and half years of marriage. It was reported Simpson, who married the former Fall Out Boy bassist at her parents' California home in 2008, filed documents in LA County Superior Court, citing "irreconcilable differences" as the cause of their split.