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This is Dr. David
every parent raises their child differently
it sounds like you are suspicious of potential sexual inappropriate behavior in bed when they all sleep together.
it sounds like your daughter would tell you if any inappropriate sexual activity was occurring in bed.
you can ask your daughter if anyone has touched her in inappropriate places
some parents have their children sleep with them so they are more secure and sleep better.
other parents have their children sleep on their own early on
if there is no inappropriate touching or sexual activity in bed, then just all sleeping together should be ok.
let me know if you have other questions.