My dh has primary. Bm gets SD every other weekend. She is always having to miss her weekends for whatever reason. But never gives proper warning or reason. Then asks for two weekends in a row. We always give them to her. But its getting old. We hate this inconsistency and I can tell SD does too. So we're thinking of not giving in anymore and if she misses a visit then she misses it. Not our problem. We want to get along but she's disrupting our life and we want stability. Is this reasonable??