the can contact their family any time they like and visit on their free time, and take delight in doing baptisms and weddings for family members when they are able. a man who enters monastic life will have more restrictions on his movements, but unless the order is very strict, no restriction on contacts with them.
most Catholic mothers rejoice at the prospect of a son entering the priesthood. attend the funeral of the mother of a priest, and you will see how highly she is honored by the Church.