With the long summer break ahead of us, there's a good chance that a 15-person house is on the horizon—whether it's squeezing in with extended family or planning a getaway with friends. 

These trips always come with a few surprises, and you end up learning A LOT about people when you're all sharing the same space for an extended period.

When we holiday with friends, we expose our family's inner workings — it's a very messy level of intimacy, a microdose of communal living if you will. And awkward clashes can very easily happen.

Watch: Modern Etiquette: Travel. Post continues after video.

This is why we've put together Mamamia's Modern Australian Etiquette Guide to help you out in different social situations.

From attending weddings to visiting someone's house, to navigating the ins and outs of group chats, we've got you covered.   

On today's agenda is 'group holidays'. Let's get into it.

How to survive group holidays.

If you pull out, pay up.

Don't string your friends along with a "maybe" in the planning process. And if, for any reason, you need to pull out after deposits have been paid, you need to cough up for your share (unless someone else is willing to replace you).

Don't be stingy.

If you're booking a house and people are staying a different number of nights, that shouldn't impact the cost per person — every person should pay the same regardless if you opt to stay one less night.

Determine compatibility.

Are you morning people, or late-night party animals? What if they are a high-octane activity family who are up at 5am, and you're more of a sleep-in and chill family? If you are all sharing communal spaces, this needs to be considered before you commit, and maybe separate dwellings are better. Nobody wants to be scolded for staying up and having a good time on holidays. And if you're an early bird, you don't want your beauty sleep disturbed by your wild friends.

Have the uncomfortable money chat.

Have clear expectations on budgets before you head off. Things like combined groceries, types of restaurants and activities. This will avoid tension while on the holiday if everyone is clear about where budget limits stand.

Listen to 'Bonding or Bickering? The Ups and Downs of Group Holidays'. Post continues below. 

Make a bucket list of activities.

Before you head off, make a wishlist of group activities you want to do together, so it's not a scramble while on holidays, and there isn't tension. You can totally opt out and do your own thing if you don't want to go on a five-hour tour of historical castles, but make that clear.

The "Nicole" gets first dibs.

The Nicole is the group organiser. The person who does all the organising/booking of the house gets first dibs on room selection. Nicole deserves it for all her prep work.

If you see something that needs doing, do it.

Is the rubbish filling up? Recycling needs to be taken out? Dishes need loading? If you see it, just do it.

Be respectful of people's time.

Nobody likes being made to wait. Even though everyone's on holiday, and you want to be laissez-faire, it's rude to roll up late for an activity or outing.

Speak up when it matters.

Good communication is the backbone of smooth group travel. You need to be able to calmly communicate feelings, boundaries and then get on with it.

Don't tell off other people's kids.

Other people's kids can be annoying, but there is an unspoken parenting rule. Don't tell off other people's kids. If something really needs addressing, tell the parent.

Divide and conquer.

Let each member pick a day. They're in charge of that day's activities, restaurants, logistics of getting places, buying tickets, making reservations. This way, everyone gets to do their top wish list item, and one person doesn't have to be the travel planner for the entire trip for everyone. If someone wants to opt out of an activity, they are welcome to do so.

Go with the flow.

Even for the most organised of holidays, rain will happen, things will shift and change. A go-with-the-flow attitude and flexibility is key. Nobody wants drama over a rescheduled tarot reading. If the group doesn't want their stars read at the last minute, go it alone and without carry-on.

Let sleeping dogs lie.

The meet up time needs to be determined the night before for the next day, so some people can sleep in if they want to, and the early risers can pop off their unrelatable 5am jog.

Food should be shared, not hoarded.

Food should be shared, whether you all chip in and someone brings all the food. Or if you bring your own, people need to share food. No 'who ate this' or 'I'll pay less because I didn't eat that'.

Schedule alone time. 

Set the expectation that not everything needs to be done as a group. Schedule some time with just your family. Everyone needs a bit of space and downtime. Being all together the entire time, people can get on each other's nerves.

Disagreements will happen.

When they do, aim to be respectful. And remember you only have control over your own actions and reactions. Keep it light, keep it moving.

One team, one dream.

Nobody is there to be served. Make sure one person/family or, importantly, gender, isn't left as the hired help, and the others are like the upstairs of Downton Abbey. If one group cooks, then the other cleans up.

Leave the toilet clean.

This feels like it shouldn't need to be said. But unfortunately, it does. If you're sharing a bathroom, leave it clean after you use it.

Pay your share.

Transferring and keeping track of money can be a nightmare. Using a money sharing app. You enter all shared expenses and "settle" at the end of the trip.

Don't sweat the small stuff.

Your trip should be all about having fun with your friends and family and making memories so don't sweat the small stuff. And remember that a positive attitude can do wonders in creating and maintaining a better group dynamic and vibe.

Want more modern etiquette guides? Click below:

Modern Etiquette: The 38 things we all really need to stop doing at weddings.

Modern Etiquette: The 21 group chat rules you're definitely breaking.

Modern Etiquette: The 26 plane and travel rules we wish everyone would follow.

Modern Etiquette: 23 do's and don'ts when you visit someone's home.

Feature image: Supplied.