My Uncle and Aunt don't accept their grandaughter...

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My cousin married a woman that already had a daughter named Chrissy. Since then they have had two children of their own and Chrissy is now eleven years old. Chrissy is what they would call a wild child, she acts out a lot and says the wrong thing, but I feel its because she hasn't gotten a lot of love and attention growing up. Her real dad is a complete A-hole and never wants to spend time with her. My cousin is a great father but it seems to me, he's always yelling at her no matter what. My Aunt and Uncle were thrilled at the idea of becoming grandparents, but they don't really act like Chrissy is their grandaughter. My Uncle has pictures of the two youngest ones in his office, my Aunt has pictures of the two youngest one's around the house, but none of Chrissy. I feel so bad for her and I try to explain to them, that once my cousin married Chrissy's mom, Chrissy became at least their step-grandaughter. What can I do here to make them see how wrong they really are??? Has anyone else been in this situation or known of anything like this?? Any advice would help! Thanks!