Like Jim M, I was married and had kids before I even started. It's impossible for me to write while the kids are awake and around, but once they're in bed I'm okay. Ellen's presence doesn't bug me when I'm writing -- and as often as not, she's four feet away, also writing.

This will sound stupid, but we occasionally IM one another or talk on a mud rather than speak out loud, when we're both writing. It disrupts our train of thought less than actual speech.