Even though they had some rough and rocky times getting adjusted, they were willing to do everything possible to make it work. It finally jelled. It worked.
Dealing with Parents
They could also relate to the situation with your parents. About the same time they were adjusting to the four children, the husband's mother had to move in with them for a while. Again, the wife was willing to help her mother-in-law. She put herself in her husband's place. She explained that if her mother needed help, there would be no way her husband would keep her from helping. That's the way she felt about his mother. She knew that if she treated his mother right, if the time came for her parents to be helped, her husband would be willing, also.
The idea of wanting to have your spouse all to yourself is understandable, but not practical. The reality is, when you marry, you do marry the other person's family (contrary to popular thinking). Many couples have solved the problem of being around the other family members by moving to far off places or to the extreme other side of town. However, with telephones and the internet, you are still as close as technology. At least, you don't have to see them at meal time often.
I never had to blend a family. But there are some suggestions for successfully blending families taken from The Woman's Study Bible. KJV, Thomas Nelson Publishers, 1992, page 65, "BLENDED FAMILY: Building a New Hom" that I want to paraphrase for you:
Take these suggestions seriously and practice them religiously. Take a lesson from the experts that tell us that successfully blending families can be less stressful and more fulfilling when you look clearly at the big picture. There's more people in the family than the two of you.