Dh and I work together as a team.
I usually do the "leg work" researching educational methods, curriculum and keeping Dh up to date on what is available in the world of home education. When it comes to planning the school year both of us do it together. We play off of each others strengths. Dh's strength is math, history, writing and science. My strength is geography, world cultures language arts and foreign language.
Although I am the primary teacher, Dh is always available for "technical assistance." LOL!
I like the comment Jessie Wise makes in Chapter 38 of the WTM "Home education is a family commitment." To me her statement speaks volumes.
One thing I suggest to prospective home educators and the mothers in my support group is to sit down with the spouse/partner to discuss and write out on paper "Why are we home educating? What are our goals/objectives for home education?" If the spouse/partner is included in the planning stages more often than not they are more receptive to assist the primary teaching parent on a daily basis.