Donna,
I would ignore your sister in law as much as you can. She apparently doesn't have your heart interest in mind when she speaks. Imagine the unhappiness she has in her life..., then be glad you don't have it in yours! As to one more cat...that isn't going to make or break you. I would see to it that you pay her off quickly, cause then she is out of your financial hair. Tell her she is lucky, cause she is married into your family...he he he...

Be good to yourself, and only someone that 'lets' herself be treated as a child can be treated as a child. You are an adult, so, just ignore her...or do what I do...secretely roll your eyes or dance around the room when you speak to her (works best if you are on the phone, seems kinda obvious if she is there in person).

{{{{{{MEAN PEOPLE PROTECTOR HUGS}}}}}}}}}}}}}
Johanna