Re: Pregnancy, heat etc questions
When do you expect that Pennie will go into heat? Any time between 4 and 18 months of age.
Will Frostie be mature when she does? Maybe, maybe not.
When will Frostie be mature? Expect him to be mature at 6 months of age, but he may become mature earlier or later than that.
Will Frostie spray? His father has never sprayed before in his life. This you simply won't know until he's mature. Some say spraying hereditary, but I doubt it. I believe it's more about the enviroment. A fertile male that's surrounded by other fertile cats is quite likely to spray while a fertile male living alone (or with neuters only) in a family is more unlikely to spray.
Will this effect my other 2 cats? Maybe. A fertile male want's to protect his current territory and he might wanna expand it. Don't forget that fertile females can be very bossy and they can certainly effect other cats, in a less good way if one is unlucky.
Any other things I need to know? You need to know that you can't have the male and the female togehter alone... at all since the female can go into heat very, very early and males can to and you don't want a 4-5 months old female to get pregnant. So don't leave the two of them together unsupervised!
You also need to know that breeding cats is not an easy thing to do. It takes a lot of work, first of all to find good cats for breeding and then you need to have tests done (at Persians at least PKD-test). It costs money, time, sweat, blood and tears to breed cats, even if it's just one litter so do think about it. Are you ready to be awake for several days just to make sure your pregnant female don't have her babies all on her own? Are you reade (and an you afford) to take her to the vet in the middle of the night if something goes wrong?