Why didn't the [grand] mother talk to the priest before the last moment - she says she was preparing for this for months.
I agree, James!
Why did they let him go through prep if he wasn't eligible?
That is a good question, Rebel. If he was in a religous education class for First Communion, the instructor should have said something much, much sooner. What we don't know is whether the preparation class was taught by the priest (usually not, there are not enough priests to do so), a lay instructor (often the case case), or if he was not in a class and the grandmother taught him on her own (unusual, but the news report hints that may be what happened):
Irma Castro said that she had been helping to prepare Kevin for months for his communion
Unfortunately, in a local TV news report details take a back seat to time constraints. It does not state whether the boy was in the parish's preparation class, or if he was being "home schooled".
Father Henning said he offered Castro an alternative to the first communion. He offered them the sacrament of the anointing of the sick. 'That is the anointing they give you before death. That was very offensive,' Castro said.
Hers is a common misinterpretation; though often referred to as "last rites", this is the sacrament of healing:
"The Church believes and confesses that among the seven sacraments there is one especially intended to strengthen those who are being tried by illness, the Anointing of the Sick:
This sacred anointing of the sick was instituted by Christ our Lord as a true and proper sacrament of the New Testament. It is alluded to indeed by Mark, but is recommended to the faithful and promulgated by James the apostle and brother of the Lord."
A communion is not really a big deal it is not a commitment other than saying you wish to join a faith community.
In the Roman Catholic church, Communion is a big deal and taken very seriously. It is not merely stating you wish to join. The Eucharist is not considered to be merely symbolic; it is not just emblematic bread and wine.
"The sacrifice of Christ and the sacrifice of the Eucharist are one single sacrifice: 'The victim is one and the same: the same now offers through the ministry of priests, who then offered himself on the cross; only the manner of offering is different." "And since in this divine sacrifice which is celebrated in the Mass, the same Christ who offered himself once in a bloody manner on the altar of the cross is contained and is offered in an unbloody manner. . . this sacrifice is truly propitiatory.' "