There are no more practical measures but to avoid contact with sores.
Without sexual activity, HSV2 is pretty much impossible to have.
HSV1 is very common and you may have it even if you do not know it.
Your mother's hand sores were probably not herpes at all. Your grandmother's back sores may have been shingles, which is the chicken pox virus and not the same as HSV1 or HSV2.