Easiest way to screw some familial relationships up is to use them to do business. Ask for advice. Don't ask them to do business with you.
My family has always financially tapped one another for business purposes.
We've never had any serious issues.
Each family is different.
To the OP: Yes. If you're comfortable with it, do it. Any family member that gets upset with you for choosing your best financial option, sucks.
This post was edited on 4/4 at 11:09 am