Problem: How to sibling proof your room
Talk to your siblings.
Tell them nicely but seriously that you need to be alone, and thank them as they leave. Be kind.

Answer: Don't push your siblings out of your room or slam the door in their faces. Your siblings are more likely to be respectful to you if you're respectful to them.

Problem: How to influence people
Be outgoing.
Having a friendly, outgoing personality goes a long way when it comes to having an influence on the people around you. People respond to people who are comfortable in their own skin, and are more inclined to follow their lead.

Answer: But don't treat them like they are lower than you. Treat everyone like a friend, not like a younger sibling.

Problem: The cookies go into the oven and bake for 9 minutes, and a new batch is put in the oven. The warm cookies are put on a cooling rack. The person washes, and drys the silicone baking sheet. they
Answer: roll the baking sheet up and show us the finished cooling cookies.