What does "estate" include? Brother wants insurance, annuity proceeds for which I am beneficiary.? - split annuity

I am the executor of the will of the mother, she left $ 4000 brother and I share the cost of services, invoices remainiing I pay my money, there would be some kind of inheritance "of the farm. Otherwise he would have nothing. It means that leave the property, because Mama gave me the money, and mentioned that "other reasons were" made to Me.Then is an insurance and pensions-listing me as a beneficiary, an income list us as co-beneficiaries, and a pensions, which are listed as recipients. Reaffirms all say that my mother wanted to leave because he gave me $ previous years. He said it would pay for services, or if he thought he could make the recipient. dates of this policy prior to the will. He wants it all. He paid more than agreed (above the ticket to his son), he has little mention of gas to drive here. What is the "mass" What shall I give? Please help.