TLDR: When selecting adults with whom you will travel, only consider those whose reasons for travel align with yours.
Different people have different reasons for traveling, especially internationally. Some travel for work. Some travel to see family. Some travel to see history, art, music, and cultures. Some travel to relax/be pampered. In many cases, fulfilling one of those comes at the expense of others. Those reasons for travel will affect one’s choice of habitation, day-to-day activities, price tolerances, basic “expectations.” I have found that almost everyone gets very frustrated when they want to travel with person x but person x wants different things out of their trip. Maybe your trip is only one to three weeks. You may not be able to see family member y for as long as person x would like while still doing all of the things you want.
Traveling with family as an adult can be fun, assuming you have a good relatoinship with your family. For those with parents who immigrated across the world, traveling with parents as an adult can be especially interesting, particularly when you travel to your parents’ childhood “home”/stomping grounds and you have little familiarity with that location. It is an amazing way to see your parents in a different light, learn more about your parents, and maybe gain a greater appreciation for/understanding of their world-view. This is moreso the case when traveling as an adult than traveling as a child. However, by the time you are, say, between 18-30, you have your own personality and interests, and likely have different priorities. For example, 18-30 year old you will probably not think “I need to do x because I will probably never come here again.” Whereas your 50-60 year old parents might be concerned with such thoughts.
Be extremely wary of traveling across the world with individuals who want very different things out of the trip. Seriously ask yourself why your potential travel mate is traveling and whether they would be comfortable with parting ways for a few days and potentially coming back together. Would such a person be angry/offended if you decide that something very important to them is not worth your limited time (when you may only have 1-2 weeks of time off from work). If there are real incompatibilities, it is perfectly acceptable to say “there is simply not enough time in the 1-2 weeks of our travel to do everything we collectively want to do, and making those into two separate would allow us to make the most of our time and our travel.” When traveling with immigrant parents back to their (and, in a sense, your) home, DO NOT allow them to hijack the trip and your time by guilting you into meeting a dozen of your 16th cousins 5-times removed when going to an art gallery or live music concert or hike is a better use of your time. Family is important but so is interacting with art, music, nature, and culture. Adults can make these decisions for themselves and should respect when others do the same. People are allowed to be in different places in life, and value and prioritize different things. People who truly care about and respect eachother understand this.
Of course, traveling with children is a different beast and outside the scope of this rambling.