Now that the Miller brothers have reunited on The Last Man on Earth, don't expect them to put the past behind them.

"We'll get to the bottom of that in the coming [episodes]," creator Will Forte tells TVGuide.com of Phil (Forte) and Mike's (Jason Sudeikis) rivalry.

According to Forte, the brothers' bad blood is (mostly) one-sided, despite Mike shaving half of Phil's facial and body hair. "I think obviously Phil has a tendency to hold on to things and get a little too aggressive with things. So I think that Mike in his lifetime has had to deal with some overreactions on Phil's part, so he's probably used to it. He's a very patient person."

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But not everything will be cruel pranks and groin-punch hellos between the pair. "He is my brother, and there are a lot of fun things to do if we are angry at each other, and there are also a lot of fun things to do if we are not angry at each other," Forte teases.

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The Last Man On Earth airs Sunday's at 9:30 on FOX