My wife and I separated 6 months ago and we have 2 sons who live with their mum. I had hoped to be able to see them more or less whenever possible so that the whole thing was flexible and fit in with everyone’s plans. However, my wife insists that contact with my sons should be fixed – the same days/times every week. This means I sometimes can’t see them if they have a party or another event to go to. How can I deal with this?