Why is my mother upset about them leaving?

So my sister moved back in with me and my mother back in June after her house burned down. My sister has two 9 year old boys that are really destructive, gross, and headache inducing. Sometimes my mother would have to babysit them and she just couldn’t handle them. So yesterday my sister finally moved out and my... show more So my sister moved back in with me and my mother back in June after her house burned down. My sister has two 9 year old boys that are really destructive, gross, and headache inducing. Sometimes my mother would have to babysit them and she just couldn’t handle them.
So yesterday my sister finally moved out and my mother claims that she misses them! She’s legit sad about them being gone!
Why?
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