not sure how to announce to family

trying to figure out how to announce to my husband's family we are going camping with them and I won't be as far as long as I hoped but I won't be able to hide the factor that I am pregnant should I tell everyone at once or should I tell the adults first and then tell the younger kids the nieces and nephews once I'm further along I will be 10 weeks while we camp but prefer to tell people at 13 weeks just in case

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