Is sending my greetings to my uncle via his daughter sufficient to lift the sin of severing family ties, given the ongoing family dispute?

The kin whose ties are obligatory to maintain are relatives with whom one has an unmarriageable relationship, such as siblings, paternal uncles, and maternal uncles. It is recommended to maintain ties with others, such as paternal cousins. The general rule is that abandoning ties for more than three days is forbidden. Maintaining kinship ties is not limited to visiting; rather, it includes anything that is customarily considered a connection, such as writing letters, sending messages, exchanging greetings, fulfilling needs, and providing financial support. Reconciling disputes among people is better than the status of fasting, prayer, and charity.