Separated with 50/50 custody of an infant

[Jack_Three_Beans]

With all of this contact, how do I give her that space?

Is she complaining or does she seemed bothered by a lack of space? If so you can scale something back. If not? Why change it?

How do I properly detach?

Great word 'dettach'; a catch-phrase that means something different a lot or a little to everybody.
What does it mean to you?

To me it meant my wife's bad day, bad attitude, bad whatever, I did not or did my best to not let it impact my day. And her good day, good attitude, good whatever, I enjoyed for the moment but did not expect it to continue.

But what is your deffinition?

Are these contacts positive for us? Is it too much? If negative, how can it work?

This is where you monitor the interactions. Not with an emotional eye, but with a logical one. Heck I read up on body language to help me out.

You should be able to determine if it is positive, or too much...and not just for her brother, if it is too much for you? Back it off a bit.

If it is negative you'll have to adjust it somehow in order to get it to work.