“Theyr also constantly talking against them when they arent here (to me and my other siblings)”
During one of these conversations, why dont you tell them that you love them and when the time comes you want to marry someone that they will love, but this whole situation makes you scared. After all, there is only one of your father, you cant marry your father (i’m assuming your mother is happy with her choice).
When someone is venting their feelings, you have to be careful not to get judgemental or say something that’ll set them off and get defensive. otherwise what you say just comes across as attacks and not what you wanted to say.
I feel that expressing yourself is helpful. maybe this can help your parents understand that you are suffering from their negative comments.