I suggest that you stray away. Unless you have a good reason to invest in BTC and believe in the technology for the long run for yourself, then you're simply going to panic dump as soon as your relative does the same.
Don't get me wrong, it's not just your relatives. When anyone close to you starts talking about how great an investment is going to be when they have had no previous experience, then they are likely succumbing to the FOMO, have no good reason to be in the market in the first place, and will be at the front of the queue to sell low when the markets go down.
since OP does have the experience into this market more than into his relative which would really be a tough situation on giving out advices since this market doesnt give out guarantee.
I do really hate up when someone do approach me asking for some financial advice and make out their steps basing on what you had said because if the market turns out to be
salty or sour then thats the time you should expect for some blaming.
I had already experienced for you to get blamed when they lost money.So ive decided on not to give any advices anymore to avoid such circumstances.
and trying to make them realize that this market isnt something that generates easy money or profit.You would be still needing to risk for you to earn.
Helping them isnt bad but dont try to feed up on what they are expecting because as stomachgrowls said you would really be blamed if
they do lost money on this investment.Tell them that you had warned them at least.