@Kenny Lewis
As @J Scott said... it's really up to you and your lender. Since your lender will be a family member you actually have more flexibility in the terms of the loan then a traditional Hard Money Lender (HML) or Private Money Lender (PML) because you already have a relationship with them and you won't need to go through a big background check.
So, if your family member lender will agree to a 30 year loan, then you can just pay it like a traditional mortgage. If the family member wants their money back with their return in a shorter period of time, then you'll need to work out exactly what terms they'll be willing to accept. For instance, if they want their money back in 1-3 years, you could agree that you won't pay them anything during the life of the loan, but then you'd pay them back fully with their return at the end of the loan. That way you wouldn't have to worry about paying them at all for the first 11ish months. During that time, you'll probably need to refinance the house into a traditional mortgage with a bank. You'd then use that money to pay back your family member.
To refinance, you'll need to make sure that the Appraised Value of the house is enough to cover the existing mortgage, plus any return you've promised your family member lender. So, the most common way to do that is to rehab the property (aka force a higher appraisal). When you get the back loan, then you can draw out some of the equity value in the house (called a cash-out-refinance), or you can possibly open a Home Equity Line of Credit (HELOC) and then use that, plus the mortgage, to pay back your family member.
I hope that answers your question.