This is far far more complicated than what you express.

My two year old doesn't have a hateful bone in her body and loves my fiancé as much as she loves me.

1. She's 2. What 2 year old hates anyone? She has only ever known having 2 households. This is the norm for her. It's not apples to apples. The 8 year old has has a very turbulent life of changes, with her bio mother walking out, you adopting her and being her mother, and now the divorce.

My 8 year old goes back and forth. Sometimes she is "okay" with my SO and I and other times she says it's weird or creepy.

1. It's always weird and creepy, but not for the reasons you are trying to push. The issue isn't a same sex issue. The issue is her mom and dad are going through a divorce and your with another person. She's 8. She doesn't understand something as complex as love (beyond unconditional).

The other night she wrote a message with her little sister's bathtub crayons that said, "Mom for sale." When I asked her what it was about she said it was because she didn't like us kissing. She said that two girls kissing is just weird.

1. Our 8 year old has never said anything negative about you and your SO. You have informed me on multiple occasions about how our children adore your SO. I doubt our 8 year old said this or at the very least said it in the context you are claiming. You know our 8 year old has trouble expressing her emotion, AND that she likes to elicit reactions from us.

Her Dad is not the most gay friendly individual and I don't know what is said at his house, but I truly am at a loss.

1. Okay, really? You know I am not homophobic, so stop trying to paint me as one, and stop trying to make it sound like you being in a same sex relationship is why an 8 year old is acting out. You only added this bit because I don't like your SO. I assure you it isn't because of her sexual orientation.

4a. I'm bisexual, and you know this. Or you're just not very observant.

I am trying to get her to read some books from.the local library that are lgbt related and her reading level. Truth be told there isn't much to choose from... I want to teach her acceptance, but I'm at a loss as to how to make an 8 year old understand that love is love... Suggestions?

1. Yes, I suggest you get off reddit and talk to me and our 8 year old, and her psychologist. You and the 8 year old have never expressed anything but positive things about your SO and her relationship with our children. Have you talked to her about the Why's? Not just "Because"? Why you love your SO, why your SO loves your children, etc? "Because we love each other." and "Because we want to live together." does not explain to an 8 year old why she should be accepting of your SO as a person in her life.

Again, you are trying to shoehorn a complicated situation with a complicated 8 year old into a singular issue, and furthermore are frustrated because she doesn't share the same idol worshiping allure of your SO that you do. In time, our 8 year old will make her own determination on who she chooses to love and accept in her life. We are to support her in her own decision making. Our 8 year old isn't struggling to learn acceptance because you're in a same sex relationship. She's struggling to learn acceptance because she is still adjusting to all the changes that has happened over the past ~year.

You know I know your reddit name. Don't expect me remain quiet when you bring up bs on a public internet forum.