Both the Western and Eastern Catholic Churches and the Orthodox Churches recognize seven Sacraments. Baptism, Holy Communion and Confirmation, are the Sacraments of Initiation. The remaining four are Reconciliation [Penance, Confession. and different names for the same Sacrament]; Matrimony; Holy Orders [Ordination to the Priesthood]; and Anointing of the Sick [in the past this was known as 'extreme unction, and understood to be the "Last Rites" received at the point of death... but that is a misunderstanding of the Sacrament]. The 5 additional Sacraments recognized by the Catholic and Orthodox Churches are understood to have been instituted by Christ (as can be found in the Bible). ie: Matrimony - the wedding at Cana.
An explanation describing how the Sacraments are Scripturally founded would be the best way to approach the situation.