Aloha MOM... I DO have a lifetime of experience with this type of situation (from all sides). It's very clear children of all ages understand "love". They really don't care what the gender is of the people who show affection toward one another. If, however, a member of the family shows discomfort or disdain towards the gay couple they too will feel uncomfortable and want to know why, "nobody likes their sister or her friend." My own Grandchilden never even thought twice about having "two Grandma's who love each other." They actually thought it was pretty "cool" and would brag at school about it... WOW times have changed! Now I have Great Grandchildren who could also care less as long as they are adored and showered with love. Of course it's best to suggest to your daughter that she & her GF be respectful with any PDA as should ANY other couple in front of your triplets. The bottom line with these situations... If everyone else treats your daughter with respect and minds their own business the kids will follow suit. Love speaks for itself! Best wishes