Thank you for your question
My name is Clare
I shall do my best to help you but I need some further information first
How long have they lived together and how old are the children
Do they actually own it jointly and has he been violent
She is entitled to return to the property whenever she wishes - breaking in if necessary
Her next steps depend on what she wishes to do.
She can apply to the Court for an Order allowing her to return to the property and forcing her ex to leave.
She can simply return to the property and tell her ex that if he threatens her again she will call the police (and do it if he does)
Or she can start divorce proceedings based on his Unreasonable Behaviour and apply for a sale of the property within the financial side of the divorce
I hope that this is of assistance - please ask if you need further details