Well about the sister-in-law deal, it may come on to her at first, unfair or your lying to get the attention she once had to herself. But before she is even 3 months, and you are pregnant, both of you will be glad to have someone going through the same experiences. You can ask them if anything you think is unusual is happing to her too. Plus, she will be the only one who totaly understands you when you complain of heartburn. Use you two as being pregnant at the same time a blessing. I was 3 months pregnant by myself, I felt so out of place! But then my best friend discovered she was pregnant also! And we both had girls! It was great having someone to talk to! Oh...&& not to mention get fat with!