Of course it's right. It's only natural to want to know. But your mother probably thinks not telling you is for the best. She could be wrong, but I'm sure she's just trying to protect you. I don't know her reasons for not telling you, but she may just be afraid it would hurt you to know.
I suggest sitting down and having a serious, adult conversation with her about it. Tell her how important it is for you to know, even if it might be hard for her and you or if it might hurt.
I suggest sitting down and having a serious, adult conversation with her about it. Tell her how important it is for you to know, even if it might be hard for her and you or if it might hurt.