This article points out that Eastern & Western Christianity are more like sisters than cousins:

These Churches, although separated from us, possess true sacraments, above all by apostolic succession, the priesthood and the Eucharist, whereby they are linked with us in closest intimacy.

Moreover, in the East are found the riches of those spiritual traditions which are given expression especially in monastic life. There from the glorious times of the holy Fathers, monastic spirituality flourished which, then later flowed over into the Western world, and there provided the source from which Latin monastic life took its rise and has drawn fresh vigor ever since. Catholics therefore are earnestly recommended to avail themselves of the spiritual riches of the Eastern Fathers which lift up the whole man to the contemplation of the divine.

The very rich liturgical and spiritual heritage of the Eastern Churches should be known, venerated, preserved and cherished by all. They must recognize that this is of supreme importance for the faithful preservation of the fullness of Christian tradition, and for bringing about reconciliation between Eastern and Western Christians.

Jesus, may East and West soon come to the full unity that is your express will