peeples has stated this clearly and wisely. Once money leaves my hands and into the hands of any family member......I consider it gone. They're my family. If I have it to give, I give it.....If they choose to pay back (providing they CAN) that's fine. However, like I said, I don't think about it anymore.
There may be a time I need to borrow. What goes around, comes around. Family is about helping..about give and take.
In your case, since you expected to be repaid....all I can say is, you should have handled it from a typical legal business standpoint. You can easily draw up a simple statement of Loan.....names, dates, amounts and conditions.....sign and have it witnessed. Without having done this, it gets a little messy and stressful.
Looks like you need to make a choice. What means more to you? your relationship or the money? You may also want to stop lending out money....period.