The startup I'm at did both of these to good effect.
You'll also notice VCs perk up once you've told them you managed to pull that off.
Is this really a good idea? Not judging, just stirring the thought-pot.
If you aren't really certain of success, then causing friends&family to invest and lose money is much worse than shutting down, that's outright evil. There's nothing inherently good or valuable in the survival of a business - your business surviving is good if and only if it is a valuable, profitable business, and if it is not, then it's wasteful to throw good money (especially good money of people who trust you) after bad. And burning all your personal relationships by acting in this untrustworthy manner to your friends&family has worse long-term consequences than burning a startup.
A lot of friends/family could get you a lot of smaller investments which could add up.
Also, just because privilege exists doesn’t mean you shouldn’t use it if it does, for you; if the option is between the death of your startup or calling in some favors, the latter is the one you should take (assuming your bet in the startup is correct, but every founder tends to think it is, heh).
You’d be surprised how many in your circle have waaaaay less money than they let on, like orders of magnitude less.
I just mean that even then, I knew some people who knew some people that had some money.
If you get to know the person more, you can actually know/guess. Usually, it's a redflag that deviates from what their standard is. (ie: A big purchase, having significant instruments that are only accessible to privileged people, or struggling to pay a small a bill when they have an expensive car)