Grandmother showers only one child with affection

DEAR ABBY: I’m a single mother of two children, an 8-year-old daughter and a 9-year-old son. My daughter’s father is involved; my son’s father is not. I was diagnosed with pulmonary arterial hypertension (PAH) when my daughter was born and given two weeks to live. My condition has markedly improved, and I am on the best treatment there is for it.