@James Harris This would be completely dependent upon how involved you're wanting to get in this. Like @Doug Smith mentioned above, the job does require familiarity with contracts and the other paperwork involved to be able to properly advise on listings and transaction proceedings. A few different options could be:
-(Most involved) Activate your license and join a brokerage which would allow you to list these yourself. This often comes with initial costs such as the MLS and association activation fees. Depending on the broker, they may be willing to help out and co-list these properties with you, but at that point you may not be coming out ahead on the commission for the sale after accounting for all fees and splits
-(Moderately Involved) Pay a discount service to handle the listings, and you handle all other transaction coordination. You could still be the main point of contact in terms of contract negotiations and such, but keep in mind your family members could just as easily do this without you involved, so that's something you should disclose to them. What you're bringing to the table in this scenario is your licensing knowledge, although limited
-(Least Involved) Refer to local brokerages/agent(s), as you mentioned in your post. This could be done in one contract for all properties and you lock in a minimum payout percentage without any additional work on your end. Most referrals that I make are paid out on a 70/30 split (30% to the referrer), subject to any negotiations on total commission that were already pre-negotiated before the referral was made