I think you are being unreasonable actually, you see them once a month, so you are actually seeing them aren’t you, if they are saying they are busy then they are obviously happy with the amount of time you are seeing the children, always remember you aren’t the parents they are, so you can’t dictate how often you would like to see them, when you say you feel like severing your ties, that to me is going from one extreme to the other, you might as well stamp your feet as you not getting your own way, you seem very judgemental that they aren’t actually married, just enjoy them when you see them op, they have their own lives to live too,