Information on a quit claim deed

my aunt gave my mother 10 acres of property. my aunt had a life time lease. the 10 acres was in my mothers living trust. my mother passed away in 2004. my aunt passed away in 2006. there is a quit claim deed with myself and other 3 siblings listed on the 10 acres. my brother is the trustee of my mother's estate. he also ownes the property connected to the 10 acres. he sent a letter to us all about two years ago saying he wanted to buy our shares of the ten acres. we all said to make us a fair market offer and it was his. we have not heard from him since. with the death of my aunt the life lease is no longer an issue. can you tell me if the land is actually ours, myself and other 2 siblings, to do with as we wish, probable sell, which would be 71/2 acres totally with the three of us or if it is still part of the trust? if we could sell it how would we go about it. also when my brother ,the trustee, drew up the quit claim deed he listed his wife, but did not list our spouses. none of which were in the trust. is that legal? the property is in michigan. thank you for any information you are able to provide.