If your bylaws name co presidents as members of the board, then you each have a vote. If your bylaws do not list co-anythings then the position has only one vote. But really, any agreement your board or membership comes up with is what you ultimately must follow thru with. Only your PTO can decide how to interpret your bylaws.
I was on a team that often had committee co-chairmen. It was clearly outlined in the bylaws that each committee had one vote. If both chairs were present at a meeting, we recognized one as the chairman and one as the co-chairman, giving the chairman the one vote for the committee.
In the case of co-officers I'd agree with swalso that, if it isn't already, it should be written into your bylaws.
Your bylaws should clearly define officers and members and in which instances they are allowed a vote. Check your bylaws to see if there is a policy for amending them and consider clarifying the voting process for the rest of the school year.
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My wife and I are also co-presidents. Being a PTO, there is nothing official outside of your by-laws. We are in the same boat and we decided as a board to have 1 position, 1 vote. Also, to help future boards, we are looking into placing it into our by-laws. I know this may not help but its what we decided was best and fair. The fun part comes in when we disagree and try to come up with one vote. That's another story.
I would just say, whatever decision your board makes, place it into the by-laws.
This is the first year I have been Co-President. We also have Co-Treasurers. One of our Board members thinks that the Co's votes count together as one vote. Another Board member thinks that each person's vote should count as one. Are there any rules that govern this? What is the correct way to count our votes? Is it different for Board meeting votes and general votes?