Tubby the Cat Missing

My brother in law's neighbor's cat, Tubby, an exceptionally affectionate calico female, has disappeared leaving a helpless litter of two week-old kittens. All have died as of today except for two survivors. My family has taken one in, which we feed with a dropper every few hours. I have Tubby's cousin, Matty, who seems perturbed. All cats in Moulton are related and look like it.