In a relationship where one has grown kids & you are expecting another child!

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My fiance n i are about 25yrs apart in age, i love him to pieces and his children and he loves me to pieces. we are expecting our first child together, his fifth and my second. his children range from ages 16-27, 3 girls who are 27, 24 n 22 while his son is 16 yrs old. my son is 11yrs old come september. his youngest daughter 22 doesnt want us having another child because she only wants him to have children with her mom which wont happen anymore plus all of his girls think he is too old to have any more children. how should we approach them. i have kind of talked with his children prior to finding out we are pregnant just to see where they would stand and i have tried to talk to them in a very easy way but now that we are expecting a child i am nervous how they are going to act, treat us and treat their new sibling. i know that this is our decision not his kids and i know that it shouldnt matter because this is something we wanted but it does matter to me. we are going to live our life doing what we want regardless of how they feel. they do what they want and got tattoos n piercings against dads will so he says screw them they just have to accept it but what is your opinion?