max number before becoming boarding house

hello. just after some actual experience or interpretation of the following.

different states have different limits in maximum number of unrelated people living in a house before becoming a boarding house and thus subject to tougher rules.

What do you guys think of the scenario below:

main house with attached ancilliary dwelling.
lets say WA has a max number of 6 people unrelated before becoming boarding house. Does the 6 people apply to the whole place including granny? or is it main house 6 and then granny

another scenario.
when they say 6 unrelated people, what if there were 2 sisters, 2 couple and 2 solo. does it mean that you satisfy the condition because sisters are related? just wondering.

Thanks for all your input and experience.
 
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