CD Type Annuities

Am executor of Mom’s will, she left $4000 Brother and I split services cost,I paid remainiing bills from my money so that he would have some “inheritance” from the estate. Otherwise, he would have been left with nothing. Will states he was left the estate because Mom gave me money before, and mentions that “other considerations” were made for me.There is an insurance policy and an annuity listing me as beneficiary, one annuity that lists us as co-beneficiaries, and one annuity that lists him as beneficiary. He claims all of it, saying Mom meant to leave it to him because she gave me $ years before. He says she meant for it to pay for services, or she thought the will would override the beneficiaries. Dates on these policies predate the will. He wants it all. He paid for more than we agreed on (like plane ticket for son) mentions how little he got, mentions gas to drive here. What is “estate” What should I give him? Please help.
State is Illinois. Was his son. He got all the $4000. I paid my share of expenses from the insurance policy money I received. No other siblings.He and I agreed on fairly minimal services. After talking to other family members, he decided he wanted much more. He traveled quickly to the funeral home and would not give permission for what he and I had agreed on.I told him this was his decision and the extra cost was his. Now he complains that he has little money left, keeps saying Mom wanted him to have all the money from all the sources. 1993 will, never changed. Annuities and life insurance were done before will. She changed only one beneficiary (from me to him) in these years.I assume the attorney ensured she understood everything. Money she gave me years ago and what I just received, equals more than he received. Current amounts were about equal before his expenses. We aren’t talking much money. I doubt brother will meet with anyone for clarification. He got less, is mad, wants more