Is it reliable to go abroad as a babysitter and take care of the villa?

Not reliable! Think about it. Those who accompany nannies and manage villas abroad are rich people. This kind of work involves his family privacy and has great responsibilities. How can he find someone who has no idea at all to do it? Rich people are not short of money, and it is such a good job. Of course, he can find someone he trusts to do it, such as his relatives and friends, and he won't go to the society to find someone.