How do you keep the peace at joint family gatherings?

Our families are pretty different — liberal vs republican, generational differences, religious vs atheist — and once the drinks start flowing, it's hard to manage the interactions. The whole thing makes me super anxious, and I don't even want to have a birthday party for our kid because it will mean bringing the families together.

How do you manage different families? How do you keep the peace and still enjoy yourself at joint gatherings?

Water bottles that are also hydration trackers

I often get dehydrated. I had the thought the other day… My FitBit reminds me to get enough steps a day, what if there was a water bottle that did the same! Fortunately, it's already been invented. Hydration trackers are a thing, and I'm debating getting one. But which one…

Is there an overall toddler handbook?

I, surprisingly, am a little late to the game on books about toddlers (12m-4yrs). Everything I am Googling is either about toddler discipline, toddler brain development, etc. All of which I am very interested in, but isn't there just an overall toddler handbook?