Old Catholics and the Roman Church
Relations between the Roman Catholic Church and Old Catholic churches varies from diocese to diocese. In some places, they are warmly welcomed and assist one another in social justice works. In others, the Roman Bishops attempt to interfere with the valid ministries of Old Catholics. Here are two references that indicate officially, that the Roman Catholic church recognizes Old Catholics are a valid part of the church universal:
The Canon Law of the Roman Catholic Church:
Canon 844 §1: Catholic ministers may lawfully administer the sacraments only to catholic members of Christ’s faithful, who equally may lawfully receive them only from catholic ministers, except as provided in ß2, 3 and 4 of this canon and in can. 861 ß2.
§2: Whenever necessity requires or a genuine spiritual advantage commends it, and provided the danger of error or indifferentism is avoided, Christ’s faithful for whom it is physically or morally impossible to approach a catholic minister, may lawfully receive the sacraments of penance, the Eucharist and anointing of the sick from non-Catholic ministers in whose Churches these sacraments are valid.
§3: Catholic ministers may lawfully administer the sacraments of penance, the Eucharist and anointing of the sick to members of the eastern Churches not in full communion with the Catholic Church, if they spontaneously ask for them and are properly disposed. The same applies to members of other Churches which the Apostolic See judges to be in the same position as the aforesaid eastern Churches so far as the sacraments are concerned.
§4: If there is a danger of death or if, in the judgment of the diocesan Bishop or of the Episcopal Conference, there is some other grave and pressing need, catholic ministers may lawfully administer these same sacraments to other Christians not in full communion with the catholic Church, who cannot approach a minister of their own community and who spontaneously ask for them, provided that they demonstrate the catholic faith in respect of these sacraments and are properly disposed.
The late Pope John Paul II issued the document “Dominus Iesus,” which was also signed by then Joseph Cardinal Ratzinger, (now pope Benedict XVI) on 6 August 2000, which states:
“Therefore, there exists a single Church of Christ, which subsets in the [Roman] Catholic Church, governed by the Successor of Peter and by the Bishops in Communion with him. The Churches which, while not existing in perfect communion with the [Roman] Catholic Church remain united to her by means of closest bonds, that is, by Apostolic Succession and a valid Eucharist, are true in particular Churches. Therefore, the Church of Christ is present and operative also in these Churches, even though they lack full communion with the [Roman] Catholic Church, since they do not accept the [Roman] Catholic doctrine of the Primacy, which, according to the will of God, the Bishop of Rome objectively has and exercises over the entire Church.”
It seems that the Holy See considers Old Catholic bodies to have valid priests and sacraments based on the above.