I was looking at THIS picture when the Guinness name finally made a connection that I hadn't previously considered.

Clare Hazell is associated with E&M, we know from all of her trips to pedo island.
CH was formerly married into the Guinness family.

Rachel Chandler married into the Guinness family through Arthur Edward Guinness illegitimate son Tom. <<--scroll down on the page

Based on the thread Where is the baby? , is it possible that RC was married into the Guinness family for protection and/or possibly something else, such as binding E&M's secrets of the island and its operations?

I think this bears a lot more looking into.