My aunt goes to casinos a lot. For the mean while, I suggested that she plays online casino to avoid the risk of the virus. Some of her friends are secretly gathering in their own house to continue gambling and I discourage this because the global pandemic is no joke. Online casinos are the best alternative due to the lockdown.
Most of my family relatives are interested and addicted to play in casinos and I also says that they should stop playing because of the risks of having Covid-19. But the good thing is the government in my country force closed all of the casinos and off shore games in my country because of the community quarantine. I do not want to teach them online casinos and gambling sites because it can lead to them to become addicted to it.
You are without a doubt facing a difficult situation, if you tell your family relatives about online gambling that could cause them a problem on the long term as they do not seem to have their gambling under control, however if you do not tell them even if all the casinos are closed they could find a way to gamble anyway, they could gamble in underground casinos or they could play with other people that want to gamble and that could be very dangerous with the covid-19 crisis still in place.