Yes. If you marry a Thai woman, you have to support her family too (just like a Filipina). Although this is not mandatory, it is usually expected of the children to support their aged parents when they're grown up. This is part of the asian culture in general. Also, in the Philippines or Thailand, there is no such thing as home-for-the-elderly (unlike in the US or Canada) where retired or old-people can be entrusted to be taken care of. So parents are much on their own when they become very old, unless the children will provide support for them.