But your story looks like a cookup stories, how did your suddenly invested without him knowing about the kind of wallet to use and where to buy bitcoin.
Lets cut them some slack and assume that its what happened which is maybe not a poor attempt to draw some merits.
Still advising a family member who earns a specific amount per month to invest a part of their savings into bitcoin is a good advice as long as the person investing knows the risks involved and the nature of bitcoin, its problems with the government and so on.
Assuming "Bd officer" to be Bangladesh origin, I doubt how much they are actually investing in bitcoin because of their government's restrictions on crypto.
Maybe I think for him to draw merits to himself, the write up should be more organized and how he goes teaching than just slicing it short and it looks very confusing and not true. Before convincing people to invest in bitcoin there are some certain things they must know because whatever that happened with the investment he would be hold responsible because of convincing he did.
So for my advice is that teach them the whole concept of bitcoin, usefulness and important more especially the security aspect of it then let them learn to read more content the relates with bitcoin to build their faith and belief towards bitcoin before finally making decisions to invest in bitcoin at this point you may see that everything is in line and whatever that may come of it they are already aware of the risk associated with the investment they are about to venture into.