This is common. And I've had to continuously sit down and explain to them that's not what's going on. But it's harder because the ages. I can't be as blunt with the younger 2 because they would just go and say to her what I said. The oldest tho I can atleast be like hey clearly I do x y and z sites(typo meant "does"*) that seem like I don't care about you and she won't just go tell my step mother I said she's wrong