Is it obligatory to sever ties with the wife's family and boycott them after the marriage of the girl who became pregnant from adultery as a result of paying a fine, and does this please Allah?

Both parties must repent to Allah for the sin of zina (unlawful sexual intercourse). The dispute and estrangement that occurred between the two families might be a consequence of the sin. It is obligatory to maintain kinship ties and forbidden to sever them. This situation should not be left as it is. Rather, righteous individuals should be appointed to reconcile between the two families and encourage them to reconnect with their daughter, for reconciliation is best.