We have "strange" dietary requirements for out cats

The two "Old" cats have chronic renal failure (CRF), and have to have CRF food, Saussi is/was a very picky eater, particularly when stressed - in fact, he almost died when we brought him home in October due to not eating. Saussi and Suiki - brothers - belonged to my wife's best friend, who was also MY best Friends Mom (yes, my wife's best friend was older than any of our parents). Helen died the last week of September, and we took he cats (as we promised to do 5 years ago when she adopted the kittens)

Anyway, cat food wise, we have the special CRF food, the regular kibble (which all 4 cats love - even though the fun is keeping the 2 old cats out of it, while allowing Saussi 24/7 access), plus Saussi's canned food (which his brother loves too) - along with a ringers lactate set to do sub-q fluids on the old cats