If you share a house, you should share the housework. Don't leave it all up to your partner to do. Even if you work all day and your partner is home all day, she will have been well occupied with the children and some of the home duties. Just because you walk in at the end of the day or week and put your feet up doesn't mean all of the house work is done. If you have trouble with who does what, sit down together at a time when neither of you is feeling grouchy and split the chores up. You don't have to take 50% each - the split should depend on your day time activities as well. But, ensure that you both contribute to the home duties.