Do i have to tell work and income that i have recieved money from my mums life insurance?

Hi ,i am on a benefit and am wanting to know if i need to tell winz that i will be getting money from my mum passing away. I am hoping to put some away for my kids when they are older and buy a car as we dont have one and also pay bills and I would hate to think that they would take it as we need it ? and will never have that kind of money again. ? I am also using some to get school uniforms for my eldest daughters.