No stress holiday

Help! I'm going home for Christmas to tell everyone that I'm pregnant. My husband is very excited to see his family but when I'm around them I become very stressed out. He has a large family aged 18 to 7 months. I get overwhelmed with all the people and noise. I'm 12 weeks pregnant and trying not to stress since its not good for the baby. Anyone have tips on getting through the holidays with little to no stress?? I really need some advice.