BILs DD is nearly 16 and he has separated from his ExP. He thinks DD will want to go with him (she has always said this) and their house sold. So far he has not spoken to DD about this yet as ExP is denying him access and monitoring her calls/texts. Also we think DD is too scared of her mum to say anything openly. The split is very recent and nothing financially settled yet. Does he have to go to court to get residency as she will be attending college until 18 or can she just pack a bag on her birthday and leave?