Prying questions

Kait
So my SO has 2 younger brothers and they have both proposed to their girlfriends in the last 6 weeks. We are planning on getting engaged and have discussed sometime in the next year or so but idk when. The issue is we are getting bombarded with questions and comments asking us when we are going to take the plunge. We are already the odd ones out in his family since we live together before we are getting married. Did anyone else experience this? I'm struggling with how to respond that doesn't seem weird or rude. I personally don't think it's anyone's business when we get married but his family is really nosy.