I was teaching middle school when my first son was born and I took my full 12 weeks of FMLA. During that time I did absolutely nothing - no lesson plans, no grading, etc. I had met with my long term sub several times, felt totally comfortable with her and she and my partner teacher did everything together. A few years earlier I did the same when my partner teacher at the time was on her maternity leave. None of my administrators contacted me except for congratulations and nothing was expected of me while I was gone. Maybe that is weird of my school/district???
to the OP: so sorry about your DH's job. That sound super crappy of his company. Our country is so backwards with this family leave stuff!!!