Jenna thought her day couldn’t get worse when she found her sister and her family settling into her home without asking. But just as hope seemed lost, an unexpected knock at the door set in motion a delicious serving of instant karma. I used to be close to my sister. But everything changed after she got married — and what happened recently? I’ll never forget it. My name’s Jenna, I’m 31, and I own a humble three-bedroom house. Nothing extravagant, but it’s mine. I’ve been paying the mortgage for