Problems with EC

I don't think it's illegal, just seriously unrepresentative.

The solution is to get as much support as you can from other owners then at your next agm there will a compulsory item on the agenda where you have to decide how many people you want on your EC.  I'd suggest 5 or three at a pinch – just make sure you have enough people prepared to stand.  If the number of nominees is the same as or less than the number of places, you don't even need to have an election but you will need a simple majority to get the size of EC that you want.

Bear in mind that you have to be nominated by the owner of a different unit if both you and your husband want to stand.

Once you've done that, the fact that the other EC member has five units has no bearing on ERC meetings.  It's one member, one vote, although obviously they have a huge influence if they want to take an issue back to a General Meeting (where all their votes count) or even elect their own EC.

But don't make this an attack on the multi-unit owner.  It should be presented as a positive effort to get more involvement in the running of the building, especially from people who actually live there. A softly-softly process of getting people involved now will ensure smooth passage of these changes when the time comes.