i have a ds age 7, and 2dds age 2 & 3, mil often used to have dd1 stay over at her house on a saturday night, and my ds the od time {hes not keen on sleeping out}, she wont allow dd2 to stay over the reason being is when she was 7month old they were going to have her over night but she cried and they had to bring her back down at 8pm .
this was 16month ago and they wont have her since then, however they have just bought a new bed for dd1 to stay in so she can stay whenever she likes, i have told dh none of the kids are sleeping there now.
i can detect a sense of favouritism here !