Opinions

So guys need some honest opinion. So I have 2 kids and my husband has 3 from previous relationships. We have been together for 7yrs and marry 2 yrs. We are 35 and 37. I am wanting a child of our own to share. But my mother tells me I don’t need anymore babies. What do y’all think on this. Should we try to complete our family with one together or be happy with his and her children.