Mother and Fathers attire

The parents can wear whatever they'd like. You don't need to choose attire or a color palette for them. I would have the usher match or coordinate with the groomsmen.

My FIL wore a darker grey than H and his GM and he wore a blue shirt and patterned tie, whereas H and GM wore ivory shirts and black ties (H wore a bow tie) - but FIL had a pocket square that matched the guys (and of course his boutonniere). My Mom and MIL wore emerald green and navy blue, respectively, and the BMs wore teal.

I just asked that none of them wear black or white, and that they be comfortable in their attire.

Our colors are lavender, gray, and silver with accents of white.

GM and Groom are in gray suits with white shirts, purple ties and purple pocket squares.

BM are in purple dresses with bouquets.

Mothers are wearing plum dresses with corsages.

Fathers are wearing gray suits with white shirts, plum ties and bouts.

Our brothers and sisters are not in the wedding party or ushers or anything like that but we did get them a bout or corsage.

You can always give them a specific boutonniere and corsage based on the wedding colors. That way they can still wear anything they want, but wear whatever they want. I would just let them know the colors in the boutonniere and corsage ahead of time!

Our wedding colors are gold, plum & lavender. My mom is wearing a similar color of the bridesmaid & FMIL is wearing lavender. My dad is wearing a gray suit, with a purple tie, and handkerchief.

Parent wear whatever they want. If they ask you - that's way you should tell them. If they choose to match, great - if not, that's also great.

Our wedding colors are teal, burgundy, emerald green, and light grey/silver. The bridal party are all wearing some combination of these colors. My mom wanted to wear something "dark colored and sparkly" so she's wearing navy, and my dad is wearing a charcoal grey suit (likely with a navy tie to match my mom).

Navy is almost always a good bet if you want to give them ideas.

The moms asked that the dads match the groomsmen because they didn't want to put up with finding them an outfit lol.

On the other hand the moms are free to wear what they like.

My colors are burgundy, olive, and sunflower and my mom decided she didn't want to match my colors herself. She ended up picking a beautiful dark blue gown that I think she looks amazing in. I'd say she can probably wear what she wants to (within reason, no white and preferably not matching bridesmaids) I told my mom I'd even be fine if she wore burgundy if she found a dress in that color that she loved, but she self-policed herself xD

Maybe go dress shopping with her if you can and put in your own input.

Hey Heather!! Did you figure out what color you would like everyone to wear? What color will your FMIL be wearing?