Denise, it ought to be difficult for you, and much more very for your ladies, especially because you value others family members’ relationship and would want to store it. I have seen too many cases of which “if-you’re-my-friend-you-can’t-be-anyone-else’s” thought.
One efficient way to countermand it will be to react with some variation regarding “if-YOU’RE-my-friend-then-you-won’t-blackmail-me-and-make-me-miserable-by-forcing-me-to-choose-between-you-and-everyone-else-and-treating-me-badly-if-I-pay-attention-to-anyone-else-while-you’re-around”. (さらに…)