Need a lawyer that take there fee out case

Mom died two years ago she left her three kids bank shares : we should’ve got 20 something thousand each . My brother went an lied said he was the only child and he kept the money . There should’ve been three signatures not one and the bank new that cause our mom was married to the bankers step son for 17 Years . We are needing a lawyer that can do case and take it out of money we get back. my sister talked to someone who told her the money was bonded so we can get our money and they will go after brother who can help us this month is two years