I am planning on asking my sisters to be my bridesmaids. I don't know how this is supposed to be done. One lives a few hours away and I see her occasionally at family gatherings and holidays. My other sister lives a half hour away and I see her slightly more often than the other sister just because of location. Now, I don't expect big help with planning, just for them to be there with my on my day. So, do I wait for the one sister to come up one weekend and invite her over for dinner along with the other sister and ask them both then? Or shall I just ask them next time I see them in person? Or will a phone call suffice?