My [24F] sister [25F] and her bf [25M] are upset because my fiance [27M] proposed to me and have started shaming us on social media

Your sister and her fella sound way too immature to get married, in my opinion. He was going to propose to her 'spur of the moment' to fix a rough patch and clearly has not thought through the level of commitment that this type of decision comes with. The fact that he also chose a family dinner to do this, along with the subsequent slander on social media, makes me feel this is a ploy for attention more than anything else. Perhaps this is another way for them to try to save their relationship? Rather than cause drama in their relationship and fight with each other they're focusing on you and Charlie and, I'm assuming, feeling some level of closeness from their 'us against them' attitude.

I don't think you should apologise at all, for what?! Your fiance planned an amazing proposal, you said yes and you shared your joy with your loved ones. Kendall is clearly jealous it wasn't about her. God only knows what Jack's motivation is. I would also post ONE post explaining everything and I wouldn't personally get into any discussions with people who comment. I wouldn't want such a happy time in my life to be muddled by people's pettiness. Any family who is still 'disgusted' with you during this happy time in your life needs to be blocked until they apologise and I wouldn't invite them to the wedding either. If they can't be happy for you they shouldn't get to be a part of the celebrations, no matter who they are. I think that especially goes for your sister.

I am sorry that you're having to go through this. Congratulations on your engagement. It sounds like you two are perfect for each other. I hope you have great wedding and a long happy life and that your sister and Jack grow up!

/r/relationships Thread