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How to hold a sleepover with boys and girls
Act responsibly for a few weeks before you ask.
Your parents are much more likely to agree with your sleepover plans if they feel that you're responsible enough to host a mixed-gender sleepover. Get them in the right frame of mind to agree by acting as responsibly as you can for a few weeks before you ask.
Do your chores without being told, listen to what your parents say, and keep your grades up. Mention your idea to your parents to see how they react.