person A: I have a wonderful sister-in-law.  who is always there for me when I need her
person B: That must be comforting!  It is good to have people in your life that are supportive.
person A: I feel so lucky to have her as a sister-in-law and a friend.  She is always there to offer a supporting ear and encouraging word.
person B: Don't ever take her for granted!  Make sure she knows you are thankful!