That's very unfortunate, but these types of problems can exist in families of any size, human nature being what it is.
If you're suggesting that some of the people in the family you refer to shouldn't have been born so that family life might possibly have been more pleasant for everyone else in the house, I doubt a single one would volunteer to be the person who was nonexistent for the convenience of the others.
And more to the point, God obviously intended their existence, since HE created them, body and soul.
"Before I formed thee in the bowels of thy mother, I knew thee: and before thou camest forth out of the womb, I sanctified thee..."
I’m not suggesting anything of the sort. I still have a great rapport with my ex’s family. I was merely pointing out some of the things I saw - nothing more, nothing less. Yes, some of the same things do take place in smaller families, but, I was commenting on my experience. Don’t try to put words in my mouth that weren’t intended.