Vs? Yes - vs. Contractual obligations and family never synergize well. Borrowing/Lending anything" is #2 on the list of "Ways to cause contention" between relatives. I could be wrong in your case, there are exceptions.

On the wife perspective - never let each other rest their head on the pillow angry. If intuition tells you she's not happy, she probably isn't. If you lack intuition or psychic abilities then you are in trouble because women don't always tell you when something is wrong until the detonator is at "T" minus 3 seconds and counting. Case in point - My neighbors wife is cheating on him:

#1 He had no idea she was looking elswhere or when this began.
#2 She said that it stemmed from his career aspirations or lack thereof - over a year ago. He just found out this week.

Ok, there's NO excuse for cheating and that's a dramatic example but #2 is a clear example of T- minus 3. The best thing you can do is just try to brace yourself!!