Thoughts

Hello, Im looking for opiones on this subject. I got pregnant at 16, I'm currently 19 and pregnant with my second. My finance is 25, and when I was 16 my mom did not approve or like my boyfriend. She even threaten to call the police on us. Crazy. She only seen my first child twice. We're not on talking terms, we haven't spoken in 3 years. 
She recently reached out and asked to see her grandkids. I don't want her to see them because why should she? She doesn't like my fiancé, and it's just way to much drama. 
Should I let her see them?