So my best friend is in a long term relationship she has a child from previous relationship and her partner does. They have a joint child and don't live together. Both their children from previous relationship has additional needs. Both high support but different diagnosis. They tried to live together with all three and it was difficult to say the least. She asked him to move out and now it's a difficult situation and she doesn't know what to do. Third child has not got a disability and is living with mum and sees dad usually every other weekend and during the week evenings one week and none the next as he has his other child. Needs are incompatible so makes it hard to mix the kids. This works for now however, her partner's ex is always saying she's not available when it's her time to have their child. He will plan to take him back to her and she's just saying she out and turns her phone off. He ends up having his son extra days/nights almost weekly and now my friend is upset because her son sees his dad even less. Any advice I can pass on?