How to split votes for HOA when homes ownership is skewed?

This question is submitted by Jodie S. out of Granite Lake, ON. 

We are trying to set up an HOA at our lake and we have a challenge.

Most properties are owned by a single family, but there are a couple of properties that are more communal. There are 2 that are businesses that have a large number of permanent renters, and another that is a group of 10 families who share ownership.

We are struggling with how many votes would be fair for each of these properties. 1 seems stingy but a vote for each family within the properties seems too many.

Any ideas?