Interesting question. A few thoughts:
I recomend that you go through the process and create a form ADV and brochure. It will help to set expectations on both sides and prevent confusion.
You need to check with your local regulator. My state does not allow "friends and family" advisors to receive compensation (perhaps that is everywhere? I don't even know).
Take time to know the customer and never take any risk that is not appropriate for their situation. And dollar size of the account can't be used as shorthand for "conservative".
For examle, $25K might be nothing to some, for others it is their safety net if they lose their job. Obviously, you don't want to be investing that money for someone in equity - that will be "scared money" and it will almost certainly end poorly.
If you have rich friend/family that want you to manage "pocket change" for them, that is likely a low risk situation - but you still want clarity on both sides about objectives and expectations (which form ADV brochure provides)
It sounds like your program is diversified/quality equity, which relative to other equity strategies some might do here ( focused micro cap, etc ) might be considered low(er) risk. However, the strategy will still get wacked during a major correction. So you need to look at if that person's equity allocation to your strategy is appropriate for their financial situation.
IBKR's platform is excellent for a small business, as others have said.
In other words, treat it like a real business where you have a fiduciary responsibility. If that doesn't make sense or is not worth the time, I'd not get involved in it.