DH and I have always believed that, within reason, any bad behaviour that occurs at DSS's mother's house is dealt with by her and she decides on any suitable punishment. Of course we support in terms of discussing bad behaviours, supporting her stance etc but we don't believe in punishing him twice for something by implementing our own punishment when he arrives here. Likewise, if he misbehaves with us we deal with it here.
DSS is coming here tonight unexpectedly as he has behaved badly and his mother apparently can't cope with seeing him. In the past the threat of our house has been used to punish him, i.e. 'If you do X again you will have to go and live with your Dad'. Now DSS is older he shrugs that off, secretly I think he'd quite like to come and live here but doesn't want to upset his mother.
We don't think the behaviour was anything worse than your usual teenage minor misdemeanour and we also think she doesn't give him enough freedom, but the principle is that he disobeyed his mother and lied to her. We do not share our views on his mother's rules and punishments with DSS, we always try to present a united front.
What DH and I can't decide on is how we deal with DSS tonight. DH is going to talk to him about his behaviour and he knows that DH is cross with him. Do we go further and take away his iPad and mobile for the evening, stop him watching tv or just treat it like a normal evening?
Neither DH nor I have a good relationship with his mother and she has been prone to very bad behaviour herself in the past but I am trying not to let it cloud my judgement here.