Hi Bev,
As far as I can find our Skym family came from around Llangerdeine. Mary married Thomas jenkins and their son John later moved down to Llanelli and married Sarah Thomas. I have no knowledge of an Ann or Margaret Skym. Only wish I could be of more help. Do keep in touch as the name seems a failry uncommon one. There are none in the phone book here.
regards Audrey Jenkins.