system
grateful: I have a wonderful sister-in-law who I am so incredibly thankful for.  Whenever I am going through a hard time she is always there for me to talk or to offer an encouraging word.  
gpt
I have a wonderful sister-in-law.  who is always there for me when I need her
gpt
That must be comforting!  It is good to have people in your life that are supportive.
gpt
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.
gpt
Don't ever take her for granted!  Make sure she knows you are thankful!