Parent dependent on US Government orders living abroad

[KIAR48]

I am living with my son-in-law who is stationed in Japan on US Government orders. I am listed on his orders as a dependent and on his letter of employment as a dependent. From reading I can only find that the exemption to extended living abroad applies to children dependents and not parent dependents, like me. Am I ok to keep living in Japan. I really have no way to live on my own in the States because I depend on them for everything.

Any help or reassurance is welcomed.

Thank you.