We have one indoor female cat. She just recently had a litter of kittens (her one and only litter) She's never been outside and only became pregnant from a male cat breaking through our screen on the living room window. Her kittens are a week old and today our neighbors cat (which is female) ran into our house I think looking for food but ended up running almost straight to our cats box of kittens. Our cat freaked out and tried attacking the other cat. I grabbed the other cat to get her out and our cat was still trying to attack the other cat up my legs as I'm trying to get it out. We managed to get the front door open and the neighbors cat jumped from us holding her to our front yard at which time our cat got out of the front door to chase the other cat. Our cat attacked the other cat in our front yard and my son (afraid one would be killed) attempted to separate them, got bit and attacked from our cat in the process. Our neighbors cat got away and our cat ran right back to our front door wanting to go back inside to her kittens. We can no longer go into our house because she attacks anything that walks into the front door. We have to use our garage door to get in and even then she is still freaking out trying to attack us. What do I do? I need some serious advice. I have four kids who I can't be afraid she is going to attack them unprovoked. I understand she originally attacked because of the other cat but she is still attacking anybody who tries to go in the house period. :'( She's never acted aggressive before so will she calm done and eventually go back to her sweet normal self???