Posting a tl;dr at the end.

My husbands family is Filipino, my family is Guatemalan. I do not EVER remember my family ever being judgmental about skin tones. My little sister was affectionately called "morenita" or they would tell her she had a beautiful skin color. I am opposite, I am pale and I lose my tan as easily as I get it. I was never told anything negative about my skin tone growing up either. My husbands family has always commented about dark skin being a negative thing. Growing up my husband believed he was ugly because of it. My husband is dark, so of course, our children are going to have a darker skin tone too. When my daughter was about 3 months old, my MIL asked me if she thought she would lighten up when she was older. 😒 I thought if anything, at least she wouldn't be hearing things like that with my own family. However. Yesterday, I was at a family gathering. One of my cousins has children who are half white and half Guatemalan. My father commented on the skin tone of one of my nieces. She has a gorgeous golden tan, and he told my cousin that her kids skin color was nice and healthy looking. I didn't think much of it, until the kids were about to go swimming. My father did not stop going on about skin tones. He told me to not forget to put sunscreen on my daughter because she's getting too dark. I held my tongue, solely because I was going to do it anyways. Then I put the sunscreen on my daughter, and because she is on the darker side, the sunscreen leaves a slight white cast on her skin. 5 minutes of commentary on my daughters skin, from not just my dad, but my aunt and mother! My dad came up to me and goes, don't buy that awful sunscreen for your daughter again. It was legitimately the same type of sunscreen my cousins kids had on (physical, titanium and zinc oxide) that I was also wearing, and I told him that the reason it looks like that on my daughter is because her darker skin tone. And that physical sunscreens do that, because I've used many different brands on her and it happened every time. I was so angry, and my husband was upset too. I told my sister yesterday what had happened and even she was shocked that this happened because we have always grown up believing dark skin was beautiful, never hearing negativity about it! My daughter is gorgeous and I do not want her to be insecure over melanin!

Tl;dr: My daughter's grandparents on both sides are negative about her dark skin tone. How can I raise my daughter to be confident about her skin tone in environments like this?

Considering telling them to shove it and not bringing her around them if this happens again.