Retinitis pigmentosa. Symptoms appear?

My husbands father and uncle are affected by Retinitis pigmentosa. My FIL has 2 brothers , out of 3, 2 of them have the disease and the third one is fine. My question is what kind of inherentance pattern that could be? Is my husband is at risk for developing RP.? His eyesight is fine so far. Is there a chance my kids will also have it. He mentioned this to his opthalmologist and he did some routine check-up and everything seems fine. Is there any way to determine if he has the disease before the symptoms appear? My husband really wants kids but if there is a possibility that my kids will inherit this disease I want to reconsider having kids altogether. because I have seen my FILs struggle and i really dnt want to pass this disease over the generations. :(