I know what you mean as I have 2 young children - both chatterboxes, and my DH is kinda loud too, very distracting.
To keep my place when knitting I either Photocopy the original so I can highlight and write all over it or carry the original around in a plastic sleeve and mark it in pencil when I want to keep track of where I am. I also use large post-its's when counting out rows where I have to increase or decrease.
I'm a great believer in row counters too, both as an aid to remember where I'm up to and as a way to stop the yarn sliding off the needle.
Because I am tired alot of the time and don't trust my powers of concentration I usually pick simpler patterns and use novelty or pretty self striping or multi-coloured yarns so that they look fancier. :XX: