auctioning a house

my mom died and left my brother and me the house we grew up in. while i was out of the country, he signed with a discount reality group for six months to sell the house at an incredibly high sale price. i disagreed with this, as his decisions are untrustworthy and irresponsible. i made my brother cancel his arrangement. he also signed a quit claim deed which leaves the house only in my name currently. i went ahead with my plans to sign the house up for an auction, which will be underway in a couple of weeks. i called the discount reality group to have them come pick up their lock box and sign. when i spoke with the realtor, she said my brother had to come in and sign a release form. knowing my brother, i know it's a safe bet that anything that he is asked to do, he won't do. i am wondering if his name is no longer on the deed to the house, does he really have to go sign the release form? can i proceed as intended?