Sorry to seem obstinate here but if the Church approves a EMHC to hold a ciborium and distribute the Body of Christ or hold the cup and distribute the Blood of Christ which is the most sacred elements of our faith, how can we say that such an infinitely lesser action performed by the EMHC is wrong. You’d think that the Church would take away the distribution from men and women who are not ordained before they would condemn someone for saying " The Blessing of Christ".
During the sign of peace, the priest extends Christ’s peace to us and then asks or directs that we do also. And so we say peace be with you to our neighbors. I see an entire family going to Communion as a spiritual journey to the table of our Lord and if that includes blessing those who cannot receive then it shows our spiritual unity. If it is an adult who is not disposed to receive the Eucharist it seems to express his/her willingness to commune and get to confession as soon as possible.
I belabored this but I just don’t see the “wrong” in such a gesture and see more benefits for the entire family…