Hello, I have an older cat who goes outside multiple times during the day, and likes to come home only at night. In the summer, my parents keep the deck door open for her so she can come and leave as she pleases. A few months ago, I got a new kitten Kisa, and I'd like her to stay an indoor cat as I've had bad experiences with my cats being outdoor (multiple of them have gotten lost) and I don't want to go through that again, especially since Kisa is the perfect kitten for me. I spoke to my parents about this, and they told me that they wouldn't make sure to keep the door closed and that they won't make sure she doesn't go outside. What can I do to keep my kitten indoors, then?