Half the family feuds out there outlived the reason they started. Nobody remembers the fight, just the silence.

Conflicts can become self sustaining once the original cause has faded. The silence turns into a habit, then into how things simply are, and after enough years nobody can reconstruct what happened, only that contact stopped. It keeps running on inertia rather than on any live grievance.

If there is a silence like that in your family, somebody has to speak first, and it may as well be whoever noticed. You do not have to settle the original matter or decide who was right. A short message with no agenda is enough to find out whether anything is still there.