Also, it's fine to take "just money" rather than money with value add. As long as it's not dumb money.
There are probably millions of companies since the dawn of enterprise that took small amounts of money from friends and went on to be successful, often because of it.
Now, I don't know how much experience you have, but taking money from family is stupid. A) they are biased. B) the familiy member will always be there, for the rest of your/their lives. C) the debt, therefore, will always be in your/their minds, especially if the "investor" lucks out of other investments. D) 25K is easily gotten from other sources.
When people say "don't use your own money" I think this includes family too. I'd much rather use mine than families.
So my advice: keep consulting, take his advice and leave his money. If it's a good idea, there'll be no shortage of money from outside sources.
Just because there is a high failure rate doesn't mean the funding is not worth it for both parties.
If the plan to make money is good, it's easy to get money, so why risk it? It's already a huge risk without involving your family.