My partner has two boys aged 12 and 15 who he sees 4 nights every 2 weeks. The boys want to spend a bit more time with their Dad, but their mother will not allow this. There is no court order re visiting arrangements, just an informal agreement between mum and dad. Going to court and involving solicitors isn't an option financially. Can dad just let his ex know that they need an extra night with him? Can she stop him? What can Dad do? Any advice would be very welcome! thank you!