Conflicts within a family are not a sign of failure, they are a natural part of different individuals sharing the same home. The goal is not to avoid them, it is handling them in a way that does not hurt anyone.
The first step is separating the person from the issue, saying this was not discussed instead of you never tell me anything, the first opens dialogue, the second triggers defensiveness.
Choosing the right timing also matters, trying to resolve something at the peak of anger rarely works, returning to it after everyone has calmed down opens real room for a solution.
The next time a conflict starts, try pausing for one minute before speaking, and ask yourself, what do I actually want to get out of this conversation?