Whats the best way to ask a neighbour to keep their cats indoors at night?

Anonymous

My neighbours have two cats. During the day, they take the cats indoors, but at night, they leave them outside. The cats get into our yard often, and sometimes they wake me up with their fighting. I have concerns that one day they may even kill the native wildlife, like the ringtail possums who have babies that use the trees in our yard right, if they continue to get into our yard. I want to say something to the neighbour but don't know how to approach this as I have never met her, but I do know the cats are hers.

Whats the best way to ask a neighbour to keep their cats indoors at night?
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