my nai nai is very ok.
I bought her a $180 present, and in return, she bought me a $15,000 present. Of course she also bought $15,000 and $30,000 presents for her own daughters. But nothing for her son - my husband!? So she treats me no worse than her own son on surface. But deep deep down, of course she loves her son better than me... This is understandable.
I love my own mother better than nai nai too.