So sorry to hear of your loss. Although we have never met, I know how you must feel, because I lost my brother in July. It was very hard for me, not only because I lost my dear brother, but I had to watch my own mother go through the loss of her son. Your mother must have been a wonderful person. Please take comfort in the fact that she is at peace and the two of you will meet again. May God be with you.
BTW - We also used the Irish Blessing that you posted at Steve's funeral.