(This post is being posted from America, so don't ask why I am up at 10 PM on Shabbat. It is One thirty Friday afternoon here.)
Ricki has been a rather serious creature of late. Here at my Mother's house we (including "I") laugh a lot more than I do at home. I don't know why, but probably because my older brother (who is also visiting my mom) keeps making facetious remarks.
The first few days, every time someone laughed, Ricki "took up her arms". She got angry, snarled, etc. We realized very quickly that since she didn't understand us (speaking as we were in English), she assumed that any laughter was a crack at her expense. My mother's first reaction to this is "Boy is she self centered." And perhaps she is.
But as the days passed, Ricki got a bit less touchy. I don't know if that is due to her gaining confidence in us, or getting used to the fact that we laugh around here. More relatives are arriving on Sunday, and it will be interesting to see how that affects the status guo.