Should I ask my husband's sister to consider being a surrogate for us?
If you and your husband want a baby can you ask your sisters?
No because I'm afraid they will refuse me.
Asking a family member for this makes the most sense. It would allow you to be closer in the whole process.
You didn't see my sister, she's not like the others.
You'll never know until you ask, so pick an appropriate time to approach her and she what she thinks. Have your pros and cons ready and be sure to answer any and all her questions so she can give it her full consideration.