DSS's last day with us for the summer was dominated by his desire to ensure that he wore the right pair of socks back to his Mums.
In his words to DP "she hates you 100% and doesn't want any of your stuff in her house or any of her stuff left here".
The positive thing is that after 3 consecutive weeks with us, at least he's now comfortable enough to express it and isn't quite so anxious about the differences between his parents.