Rose I think your sister is trying to reach out without being too intrusive and putting you on the spot. She blew it with the dog. She might be trying to make things better. This has been a very long haul with your boyfriend. Think about giving her a chance..maybe talk to your other sister about this. I have seen first hand the devastation family disagreements have caused. If she blows it again, be done with her, but I think she reached out to you the best way she knew how. You can't have too much support at these times. Take it with good spirit. You have nothing to lose and a sister to gain.