How to deal with annoying family?

Sometimes I let my in laws get on my nerves. We are planning a trip to visit soon and every time there is always ONE day where I blow up. I mean get so annoyed that I snap at them or say something with a rude tone. My family and my husbands family are very different. I try really hard and get along with them most of the time but I absolutely can't stand how close minded they are and ONE way about certain topics. I usually just ignore things and stuff but I notice they tend to ask me lots of questions about my daughter and it makes me feel like they are judging me as a parent. My husbands mom is also very passive aggressive so she really hits that one special nerve of mine. My question is HOW can I make sure I don't reach this point for our next trip? Should I make time to take a morning walk alone, bring headphones or just explain I need some chill time. They like to talk a lot and I'm more chill and relax on vacation so I have my moments where I just need to be alone. How do you all deal with family members that just annoy you so much? I'd love to hear some tips because o want this next vacation to be good. I wish I could drink wine or something but I'm pregnant so I can't really do that to chill out.