HI C.!
First off, it's easy to understand why so many wives call their husbands their "oldest child"....I never understood this until I had kids :o)
In my experience, no matter how many "heavy sighs" and "nagging" I did, the best thing I EVER did, was to simply to ask my husband for help. BUT...I had to be VERY specific! I learned that he didn't know how to "jump in and help". He needed ME to tell him EXACTLY what to do.
I would always say "honey, it would help me ALOT if you could get the bath going". Or, "please put the dishes in the dishwasher"....or whatever you need help with. But if I wasn't specific, then he thought I had it "all under control" and he just felt "in the way", so he went off to get OUT of the way.
Now, if he EXPECTS you to do everything, because you only work Parttime, then you have another situation on your hands, and your husband needs to understand how hard you work. My situation was "sort of" like this. It took my husband to be home for a day to see me "in action". I know he would be home that day (so I really made an attempt to show him). He was home catching up on paperwork, and would always "strike up" conversation with me. I said "Sorry honey, but I have to do this by 9, and this by 9:30, and be there at 10:15....and so on". Then 2 hours laters, he would try again...."I said, oh..sorry honey, but I have to get this done before I pickup the boys, because I can't do it when they get home, and I'm still trying to figure out dinner for tonight....and oh shoot, I hope I can return that call before 1...." I would really play it out for him. :o) After that, I knew he felt ignored, but I remained "loving and hopeful" that we would soon talk. Then I waited until I knew the kids were almost done eating :o) I went to my husband, and said "sorry honey, how was your day?" A minute later, the kids called for me :o) He never got to tell me how his day was, and all he saw was me running in and out of the house as fast as I could! I was exhausted that day, but I had to "step it up" for him to understand. I told him that night, that if he helped me get the kids ready for bed and helped me cleanup the "afternoon", then we might get a chance to visit for a few minutes, before I went to bed.
Needless to say, he's a HUGE help in our home today. AND he loves it! He had no idea what he was missing with his kids. Now, when he gets home, Daddy "takes over" and I can do more things and get done sooner. But, I must say that the "daddy way" is alot different than the "mommy way"... but as long as he helps is all I'm interested in :o) It took about 1 year to get our perfect routine, but it's working, and we no longer have those problems.
I hope my experience can help for your situation :o)
N.