The Church does not require that people be left on extraordinary forms of life support. Removing machines that keep someone who would otherwise not be able to survive, and have not hope or recovery are not required by the Faith, we can allow nature to take it’s course. Either keeping someone on or taking them off extraordinary life support is a hard decision, but not sinful to consider of or do. It is not directly ending someone’s life.

Pope John Paul II explained the distinction between allowing to die and euthanasia in the following manner:

[quote:34a4pxad]Euthanasia must be distinguished from the decision to forgo so-called “aggressive medical treatment,” in other words, medical procedures which no longer correspond to the real situation of the patient, either because they are now disproportionate to any expected results or because they impose an excessive burden on the patient and his family. … To forgo extraordinary or disproportionate means is not the equivalent of suicide or euthanasia; it rather expresses acceptance of the human condition in the face of death.[/quote:34a4pxad]
Evangelium vitae, n. 65.

My own poor prayers for you and all involved, as well as that the Angels lead him into paradise.