Blood can create connection without guaranteeing understanding.

Shared blood produces a real bond, a set of obligations, and often genuine love. It does not produce comprehension. Some of the people who know you longest understand you least, because they know the history rather than the person, and history can substitute for attention. That gap is one of the most common quiet disappointments in family life.

Stop asking a particular relative for a kind of understanding they have never been able to give and get it somewhere it exists. Then let the relationship be what it can be. Lowering the demand usually improves it.