No.
To receive in an Orthodox church one must be Orthodox, which means one must believe what Orthodox believe.
Of course, in extraordinary circumstances that can be waived (which I think sometimes happens under persecution between Eastern Catholics and Orthodox, but not usually between Roman Catholics and Orthodox).
My parish has a family of a Roman Catholic deacon. He attends Divine Liturgy with them once a month and they attend Mass with him once or twice a month AFAIK, but he definitely does not receive when in our parish. The children have been raised Orthodox and are very active in our little parish. They are mostly college aged now, except the youngest.
I can remember when we learned that he was finally ordained, we all celebrated with him in the parish hall, and our pastor told us we could call the Mrs. ‘Pani’.
In most cases I know of in a marriage between a Roman Catholic and an Orthodox, the marriage takes place in the Orthodox temple with the RC bishop’s permission.
One of the reasons for this is that the RC teaches that the couple perform the sacrament of marriage upon themselves (with the priest as witness), while the Orthodox teach that the priest performs the sacrament. The Orthodox cannot accept a marriage where the couple perform their own sacrament, so very often the RC bishops grants his approval (or dispensation) to wed in the Orthodox church.
