How to deal with family - "Shabbat Shalom"

[abaris]

My family is still religious. Every Friday, my dad texts me "shabbat shalom." before the Sabbath starts. (it means "have a good Sabbath")

As far as I know, it means, have a peaceful shabbes.

Both my grandfathers were jewish, but not the religious types. You will know best what your father means by sending you these messages, but outside your particular context, one could also read it as have a good weekend.