My grandma maid of 3 years has a bf. We saw her holding hands with an man at orchard. How should we approach this?

I think that as long as it doesn't affect her work, and she does not neglect your grandmother, it should be alright. Maybe you could bring it up to her as a joke and see if she acknowledges the fact that she has a boyfriend or not haha. Just because she works as a domestic helper, it doesn't mean that she can't have a life outside of work :)