How to deal with nosy in laws?

I guess this is more of a life question in how to dodge gossipy people. My sister and I have always been super low key and private. In our culture (and especially families), everyone gossips about each other and is super nosy. They have to know all the details so they can have an opinion, judge, and give unsolicited advice.


I’ve stayed away and have kept my business private as it should be. No one has the right to ask me about my finances and what my next move in life is. When husband and I were engaged, his sister highly DISCOURAGED us to get a house. For reasons we don’t know... she even asked me how much my student loans were. Keep in mind, we’re not close at all and this was not a mutual conversation.
My sister moved back to my parents after years at grad school. She saved for about a year and has quietly purchased a place. She’s been getting furniture and transitioning slowly. My parents are unreasonable and very overprotected and have wanted her to stay. My brother in law came furniture shopping with us and supposedly spilled the beans. Within half a day, my mother in law was bombarding me with all these questions. My sister in law is a big gossip and has talented hearing. She’ll always start off with, “wait what happened?!!” So when my MIL was asking, his sister responds with that typical question. And once they know, MIL will tell her mother, who will tell her daughter and their families and SIL will tell the cousins. We’ll all be celebrating my husband’s niece birthday this coming weekend and everyone is gonna see each other. My parents don’t know yet and I know everyone is gonna be asking them and my sister about her place.
I guess next time we should be more limited in who we invite with us. My brother in law was with us and he’s private but he was meeting with his dad and was running late. Dad wanted to know what he was up to