I don't think it matters if you want to promote SFI to friends, families or strangers. It really depends on the driving power of every individual.
Promoting SFI to anyone is one thing but for anyone to have this drive to persue it is another thing.
If the person has the drive, in this case, to accept SFI as a second income earner and then explore, you will be satisfied of this outcome.
So it does not matter if it is a friend, family or stranger really but if the individual has the power to drive and you who is promoting SFI to that person must also have the willingness to assist for a bottom up satisfaction.