I am doing a masters 1 subject a semester too and have struggled at times to fit everything in.

Lucky DS is a good sleeper and hates being up past 5.30pm, so once he is down I generally have 2 hours before dh gets home to study. Then we do the chores/ dinner prep together. Since dh is also doing a masters we will then 4 nights a week study after dinner too. Then the weekends are no study times so we can actually spend some time together. Unless one of us has an assignment due then we head off to the library while the other hangs out with DS. While its not perfect, we figure there will be no perfect time to do it, so while DS is young and doesn't mind so much it made sense (mind you most of the readings are much more challenging this time around being sleep deprived.

Good luck with whatever you choose