Just a statement to show concern, that's what mothers do instead of saying "I Love you". Most families don't tell other family members; I Love you, I can't remember anyone saying "I Love You" during my childhood unless it was on television. There's a lot of insincere feel good statements people make to relay concern without actually committing to it. I opine it has nothing to do with them worrying about you getting cold but by telling you to bundle up, they have an out; I told you to bundle up and now you are sick, not my fault...