I have 8 cats and, until recently, worked two jobs. Just last month alone, I spent over $1000 for vet care. If two of my cats get sick at once, as they did last month, it's a major expense. All my cats are indoor so I'm not too concerned about fleas or worms although it's been known to happen anyhow. As you know, flea meds are expensive and need to be administered monthly, especially if your cats go in and out regularly. Also, you mentioned that your daughter is opposed to taking in more cats and my motto has always been "People first". Do your best to help the cats but your family should have a say in this. Just my opinion but if I feel in my heart that I can't afford the pet, I won't add it to my household. True, circumstances change and we can't turn an animal out if we lose our job, as did happen to me, unless we're absolutely backed up against a wall and then it might be that we have to find homes for our pets. All these things need to be taken into consideration before taking on the responsibility. I would never presume to tell someone how many cats are too many. There are people here on PT who have more cats than I and they take excellent care of them. But, as you are aware, the cat population can all too easily get out of control and if that other feral does get pregnant, then there ya go. That will mean more kittens to have altered besides the mama and flea meds and shots for all of them. I'd do my best to keep trying to place the kittens if I were you and get that mama altered ASAP.