I have no idea about the child support, my experience is anything can happen in court
Do what seniors adviced...use your gross income and plug in the numbers.
As far as a place for transitions, is there a police station at a reasonable location for both of you to transfer child(ren)? I would not want to use other places since there is so much volatility.
At the least - once we had in our court order that if any issues arose at transitions (forget the exact wording, but discord), then we would begin meeting at XXX police station. So it was already written in.
I don't know legally, what your possibilites are of excluding the grandma...people always say with no proof of the substance abuse there is nothing you can do (re other parent). Since this is still parties sitting around talking, I would address it, what you've seen/witnessed, and let everyone know your not OK with it. Your attorney of course will advise you how far you can go with that. In the end though, you and dad need a clearcut list of people who can, and cannot, pick up the children.

As far as a place for transitions, is there a police station at a reasonable location for both of you to transfer child(ren)? I would not want to use other places since there is so much volatility.
At the least - once we had in our court order that if any issues arose at transitions (forget the exact wording, but discord), then we would begin meeting at XXX police station. So it was already written in.
I don't know legally, what your possibilites are of excluding the grandma...people always say with no proof of the substance abuse there is nothing you can do (re other parent). Since this is still parties sitting around talking, I would address it, what you've seen/witnessed, and let everyone know your not OK with it. Your attorney of course will advise you how far you can go with that. In the end though, you and dad need a clearcut list of people who can, and cannot, pick up the children.